2 Verb Tense Consistency

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live跟lives的用法

live跟lives的用法

live跟lives的用法【一级标题】Understanding the Usage of "Live" and "Lives"【二级标题1】Introduction to "Live" and "Lives"The English language can be tricky with its various word forms and oftentimes confusing rules. One such example is the distinction between the words "live" and "lives." Both words are derived from the same root, but they have different meanings depending on their usage within a sentence. This article aims to provide a comprehensive overview of how to accurately utilize both "live" and "lives" in different contexts.【二级标题2】How to Use "Live"1. Verb FormThe verb form of "live" refers to the act of residing or existing in a specific place. It is commonly used to describe where someone currently resides or where an event is taking place. For example:- She lives in a small town.- They live together in an apartment.In these examples, "live" indicates the ongoing action of residing.2. Adjective FormAs an adjective, "live" describes something that is happening or being broadcasted in real-time. This usage is often seen when referring to live performances, events, or broadcasts. For instance:- We watched the live concert on television.- The news anchor reported live from the scene.In these sentences, "live" denotes immediate, unedited content being presented at that moment.【二级标题3】How to Use "Lives"1. Noun Form - Plural of Life"Lives" is primarily used as the plural form of the noun "life." It refers to individual instances of existence or being alive for living creatures. For example:- Cats have nine lives.- The book explores different aspects of human lives.Here, "lives" reflects multiple instances or particular experiences of life by using it as a countable noun.2. Third Person Singular - Present SimpleIn the third person singular form (he, she, it), "lives" is employed as the present simple tense of "live." It indicates the ongoing existence or way of life of a particular individual or group. For instance:- She lives a healthy lifestyle.- The CEO lives a luxurious life.In these cases, "lives" describes someone's current habits, choices, or circumstances.【二级标题4】Key Points to Remember1. Context MattersUnderstanding whether to use "live" or "lives" becomes clearer when considering the context and intended meaning. Pay close attention to whether you are referring to an action, an adjective describing real-time events, or multiple instances of existence.2. Verb Tense ConsistencyMaintaining consistent verb tenses within a sentence is essential. For example:- Incorrect: He live in New York.Correct: He lives in New York.By ensuring subject-verb agreement, we maintain grammatical accuracy.3. Plural vs. Singular UsageRemember that "live" is generally used in singular contexts referring to one person's place of residence or real-time events, while "lives" denotes plural instances of existence.【二级标题5】ConclusionThe proper usage of "live" and "lives" can be somewhat confusing due to their similar forms but distinct meanings. By understanding their various functions as verbs, adjectives, nouns (plural), and third-person singular forms, one can effectively navigate these words in both spoken and written English. Remembering key points such as context and verb tense consistency will ensure accurate usage going forward. Continue practicing their application within different sentences to develop a natural grasp of how to properly use "live" and "lives."。

初中英语语法基础知识大全100题

初中英语语法基础知识大全100题

初中英语语法基础知识大全100题Grammar is the foundation of language, and a strong grasp of grammar principles is essential for effective communication in English. For middle school students, establishing a solid understanding of English grammar basics is crucial as they continue to develop their language skills. This essay will explore 100 essential grammar fundamentals that every middle school student should master.1. Parts of Speech: Nouns, Verbs, Adjectives, Adverbs, Pronouns, Prepositions, Conjunctions, and Interjections.2. Singular and Plural Nouns: Regular and irregular plural forms.3. Possessive Nouns: Forming possessive case with apostrophes.4. Proper Nouns and Common Nouns: Capitalization rules.5. Subject-Verb Agreement: Ensuring verbs agree with their subjects in number and person.6. Verb Tenses: Present, past, future, and their progressive and perfect forms.7. Irregular Verbs: Common verbs with unique past tense and past participle forms.8. Active Voice and Passive Voice: Recognizing and using both constructions.9. Transitive and Intransitive Verbs: Verbs that require objects and those that do not.10. Linking Verbs: Verbs that connect the subject to a subject complement.11. Auxiliary Verbs (Helping Verbs): Verbs that assist the main verb, such as "be," "have," and "do."12. Modal Auxiliaries: Verbs that express possibility, obligation, permission, and other modalities.13. Gerunds and Infinitives: Verbal forms that function as nouns, adjectives, or adverbs.14. Adjective Types: Descriptive, possessive, demonstrative, interrogative, and articles.15. Degrees of Comparison: Positive, comparative, and superlative forms of adjectives.16. Adverb Types: Manner, time, place, frequency, degree, and sentence adverbs.17. Comparative and Superlative Adverbs: Forming adverb comparisons.18. Personal Pronouns: Subject, object, possessive, and reflexive forms.19. Indefinite Pronouns: Words like "someone," "anyone," "nothing," and "all."20. Relative Pronouns: "Who," "whom," "whose," "which," and "that."21. Interrogative Pronouns: "Who," "what," "where," "when," "why," and "how."22. Preposition Types: Prepositions of time, place, direction, and relationship.23. Prepositional Phrases: Identifying and using prepositional phrases correctly.24. Coordinating Conjunctions: "And," "but," "or," "nor," "for," "so," and "yet."25. Subordinating Conjunctions: "Because," "since," "when," "while," "if," and "unless."26. Correlative Conjunctions: Paired conjunctions like "both...and," "either...or," and "neither...nor."27. Interjections: Expressing emotion or emphasis, such as "Ouch!" and "Wow!"28. Sentence Types: Declarative, interrogative, imperative, and exclamatory sentences.29. Simple Sentences: One independent clause with a subject and a verb.30. Compound Sentences: Two or more independent clauses joined by a coordinator.31. Complex Sentences: An independent clause and one or more dependent clauses.32. Compound-Complex Sentences: Combining compound and complex sentence structures.33. Phrases: Noun phrases, verb phrases, adjective phrases, andadverb phrases.34. Clauses: Independent clauses and dependent clauses.35. Dangling and Misplaced Modifiers: Recognizing and correcting these common errors.36. Parallel Structure: Maintaining consistency in the grammatical form of related elements.37. Sentence Fragments: Identifying and correcting incomplete sentences.38. Run-On Sentences: Recognizing and fixing two or more independent clauses joined incorrectly.39. Subject-Verb Inversion: Inverting the subject and verb in certain sentence structures.40. Negation: Forming negative statements using "not," "no," and other negating words.41. Contractions: Combining words to form shortened forms, such as "can't" and "won't."42. Capitalization Rules: When to capitalize proper nouns, titles, and the beginning of sentences.43. Punctuation: Using periods, commas, semicolons, colons, apostrophes, and quotation marks correctly.44. Appositives: Noun phrases that rename or describe another noun.45. Participial Phrases: Verb phrases that function as adjectives or adverbs.46. Gerund Phrases: Noun phrases beginning with a gerund.47. Infinitive Phrases: Verb phrases beginning with an infinitive.48. Restrictive and Nonrestrictive Clauses: Defining and nondefining relative clauses.49. Conditional Sentences: "If-then" statements expressing hypothetical situations.50. Passive Voice Transformation: Changing active voice sentences to passive voice.51. Direct and Indirect Speech: Reporting statements, questions, and commands.52. Pronoun-Antecedent Agreement: Ensuring pronouns agree with their antecedents.53. Pronoun Case: Subjective, objective, and possessive pronoun forms.54. Reflexive and Intensive Pronouns: Using "self" and "selves" pronouns correctly.55. Demonstrative Pronouns: "This," "that," "these," and "those."56. Indefinite Pronouns: "Everyone," "someone," "anything," and "nothing."57. Relative Pronouns: "Who," "whom," "whose," "which," and "that."58. Interrogative Pronouns: "Who," "what," "which," "whose," and "whom."59. Preposition Placement: Appropriate positioning of prepositions in sentences.60. Conjunction Usage: Selecting the right coordinating or subordinating conjunction.61. Adverb Placement: Properly positioning adverbs within asentence.62. Adjective Order: Following the correct order when using multiple adjectives.63. Verb Tense Consistency: Maintaining consistent verb tense throughout a passage.64. Subjunctive Mood: Using "were" instead of "was" in certain hypothetical statements.65. Gerund vs. Infinitive: Choosing between gerund and infinitive verb forms.66. Active vs. Passive Voice: Determining the appropriate voice for a given sentence.67. Subject-Verb Agreement with Collective Nouns: Singular or plural verb form.68. Compound Subject Agreement: Ensuring correct verb agreement with compound subjects.69. Dangling Modifiers: Correcting sentence structures with unclear modifications.70. Misplaced Modifiers: Placing modifiers in the appropriate position in a sentence.71. Parallel Structure in Lists: Maintaining grammatical consistency ina series of items.72. Comma Usage: Properly using commas in a variety of sentence structures.73. Semicolon Usage: Correctly applying semicolons to join independent clauses.74. Colon Usage: Appropriately using colons to introduce lists or explanations.75. Apostrophe Usage: Proper placement of apostrophes in possessive forms and contractions.76. Quotation Mark Usage: Correctly incorporating quotations and dialogue.77. Capitalization Rules: Applying capitalization guidelines for proper nouns, titles, and more.78. Abbreviation and Acronym Usage: Correctly using abbreviated forms and acronyms.79. Numbers and Numerals: Deciding when to spell out numbers versus using numerals.80. Commonly Confused Words: Distinguishing between homophones and similar-sounding words.81. Idioms and Idiomatic Expressions: Understanding and using common English idioms.82. Preposition Combinations: Mastering the appropriate prepositions to use in various contexts.83. Relative Clause Placement: Ensuring relative clauses are positioned correctly.84. Noun Clause Structure: Constructing noun clauses as subjects, objects, and complements.85. Adverb Clause Structure: Forming adverb clauses to provide additional information.86. Adjective Clause Structure: Creating adjective clauses to modifynouns and pronouns.87. Conditional Clause Structure: Constructing "if-then" statements and other conditional sentences.88. Passive Voice Transformation: Converting active voice sentences to passive voice.89. Direct and Indirect Speech: Accurately reporting statements, questions, and commands.90. Pronoun-Antecedent Agreement: Ensuring pronouns agree with their antecedents in number and gender.91. Pronoun Case: Properly using subjective, objective, and possessive pronoun forms.92. Reflexive and Intensive Pronouns: Identifying and applying the correct "self" pronouns.93. Demonstrative Pronouns: Appropriately using "this," "that," "these," and "those."94. Indefinite Pronouns: Recognizing and using universal, existential, and negative pronouns.95. Relative Pronouns: Selecting the right relative pronoun ("who," "whom," "whose," "which," "that").96. Interrogative Pronouns: Employing "who," "what," "which," "whose," and "whom" correctly.97. Preposition Placement: Ensuring prepositions are positioned properly in sentences.98. Conjunction Usage: Choosing the appropriate coordinating or subordinating conjunction.99. Adverb Placement: Determining the correct placement of adverbs within a sentence.100. Adjective Order: Arranging multiple adjectives in the proper sequence.Mastering these 100 essential grammar fundamentals will provide middle school students with a strong foundation in English language skills. By understanding the rules and conventions governing parts of speech, sentence structures, punctuation, and more, students can improve their written and oral communication, as well as their reading comprehension. Continuous practice and reinforcement of these grammar principles will equip middle school students for success in their academic and professional pursuits.。

nickcen英语语法入门班

nickcen英语语法入门班

nickcen英语语法入门班IntroductionNickcen English Grammar Fundamentals Class is designed to help students acquire a solid foundation in English grammar. This course is suitable for beginners who are looking to improve their grammar skills and build a strong foundation for further studies in English.Course objectivesThe main objectives of the Nickcen English Grammar Fundamentals Class are:1. To introduce students to the basic concepts of English grammar, including parts of speech, sentence structure, and verb tense.2. To help students understand and use correct grammar in their spoken and written English.3. To provide students with the skills and confidence to communicate effectively in English.Course contentThe course covers a range of topics, including:- Parts of speech: nouns, pronouns, verbs, adjectives, adverbs, prepositions, conjunctions, and interjections.- Sentence structure: subject-verb agreement, word order, sentence types (declarative, interrogative, imperative, and exclamatory), and sentence fragments and run-ons.- Verb tense: present, past, and future tense; regular and irregular verbs; and verb tense consistency.- Punctuation: commas, periods, question marks, exclamation marks, quotation marks, colons, semicolons, and apostrophes.- Common grammar mistakes: subject-verb agreement errors, pronoun-antecedent agreement errors, and misplaced modifiers.- Sentence editing: identifying and correcting grammar errors in sentences.Teaching approachThe Nickcen English Grammar Fundamentals Class is taught using a variety of teaching methods, including lectures, group activities, and individual exercises. The course instructors are experienced in teaching English grammar and are dedicated to helping students improve their grammar skills.Assessment and feedbackStudents will be assessed on their understanding and application of English grammar through quizzes, assignments, and tests. Feedback will be provided to students on their grammar strengths and areas for improvement, with the aim of helping them enhance their grammar skills.ConclusionThe Nickcen English Grammar Fundamentals Class is a comprehensive and practical course that can help students develop a strong foundation in English grammar. By completing this course, students will be better equipped to communicate effectively in English, whether in writing or speaking. Enroll in the Nickcen English Grammar Fundamentals Class today and start improving your grammar skills!。

《Grammar and usage》 知识清单

《Grammar and usage》 知识清单

《Grammar and usage》知识清单一、词类(Parts of Speech)1、名词(Noun)普通名词(Common Noun):如“book”(书)、“table”(桌子)。

专有名词(Proper Noun):如“China”(中国)、“Tom”(汤姆)。

可数名词(Countable Noun)和不可数名词(Uncountable Noun):可数名词有复数形式,如“apples”;不可数名词没有复数形式,如“water”。

2、动词(Verb)及物动词(Transitive Verb)和不及物动词(Intransitive Verb):及物动词后需接宾语,如“eat an apple”;不及物动词后不接宾语,如“sleep”。

动词的时态(Tenses):包括一般现在时(Simple Present Tense)、一般过去时(Simple Past Tense)、一般将来时(Simple Future Tense)、现在进行时(Present Continuous Tense)、过去进行时(Past Continuous Tense)、现在完成时(Present Perfect Tense)、过去完成时(Past Perfect Tense)等。

3、形容词(Adjective)形容词用于描述或修饰名词,如“beautiful girl”(漂亮的女孩)。

形容词的比较级(Comparative Degree)和最高级(Superlative Degree):如“taller”(更高的)、“the tallest”(最高的)。

4、副词(Adverb)副词用于修饰动词、形容词或其他副词,如“run fast”(跑得快)、“very beautiful”(非常漂亮)。

副词的比较级和最高级:如“more carefully”(更仔细地)、“most carefully”(最仔细地)。

5、代词(Pronoun)人称代词(Personal Pronoun):如“I”(我)、“you”(你)、“he”(他)等。

Verb Tense Consistency

Verb Tense Consistency

Verb Tense ConsistencyThere are three main verb forms for showing time or tense:Simple Tense•does not use auxiliary verbs•refers to specific time period during whichsomething happensORsomething happened and is overORsomething will happenSimple present (action goes on now): I sitSimple past (action happened and is over): I satSimple future (action will happen): I will sitPerfect Tense•uses have, has, or had as auxiliary verb•allows action to continue over timePresent perfect (action happened and may still be going on): I have satPast perfect (action happened before something happened in the past): I had satFuture perfect (action will be considered in the future, by which time it will have already happened): I will have satProgressive Tense•uses is, are, was, or were as auxiliary verb with -ing ending on main verb•focuses on “progress” of actionPresent progressive (action is in progress right now): I am sittingPast: progressive (action was in progress in the past): I was sittingFuture progressive (action will be in progress in the future): I will be sitting Each of the above tenses denotes a specific time for an action or event to takeplace. Writers should be careful to use the exact tense needed to describe, narrate, or explain.In general . . .•Do not switch from one tense to another unless the timing of an action demands that you do.•Keep verb tense consistent in sentences, paragraphs, and essays.Verb tense consistency on the sentence level •Keep tenses consistent within sentences.•Do not change tenses when there is no time change for the action.INCORRECT:CORRECT:Since there is no indication that the actions happened apart from one another., there is no reason to shift the tense of the second verb.Note another example.INCORRECT:CORRECT:The above sentence means that Mary walks into a room at times. The action is habitual present. The second action happens when the first one does. Therefore, the second verb should be present as well.Change tense only when there is a need to do so.Usually, the timing of actions within a sentence will dictate when the tense must change.CORRECT:The first action will take place in the future; therefore, the second one will as well.CORRECT:The second action took place in the past; the first action occurred before the past action. Therefore, the first action requires the past perfect tense (had + verb).Verb tense consistency on the paragraph level •Generally, establish a primary tense and keep tenses consistent from sentence tosentence.•Do not shift tenses between sentences unless there is a time change that must be shown.PRESENT TENSE PARAGRAPHAll actions in the above paragraph happen in the present except for the future possibilitydependent upon apresent action taking place: " If a cat sees the bird, the cat will kill it."PAST TENSE PARAGRAPHAll of the actions in the above paragraph happen in the past except for the possibility dependent uponone action taking place: "If a cat saw the bird, the cat would kill it."Verb tense consistency on the essay level1. Use present tense when writing essays about•your own ideas•factual topics•the action in a specific movie, play, or bookYOUR OWN IDEASFACTUAL TOPICACTION IN A SPECIFIC MOVIE OR BOOKNOTE: When quoting from a work, maintain the present tense in your own writing, while keeping the original tense of the quoted material.EXAMPLE (quoted material is shown in blue)2. Use past tense when writing about•past events•completed studies or findings, arguments presented in scientific literature EXAMPLE - PAST EVENTNote the justified use of present tense in the last sentence (shown in blue).EXAMPLE - SCIENTIFIC STUDY3. Use future tense when writing about•an event that will occur in the future.EXAMPLE - FUTURE EVENTRemember . . .•Change tense ONLY when something in the content of your essay demands that you do so for clarity.Note how the following example incorporates tense change as needed to clarify several time periods.。

英语作文批改方法

英语作文批改方法

英语作文批改方法1. Check for grammatical errors, such as subject-verb agreement, tense consistency, and word order.2. Look for spelling and punctuation mistakes,including missing or misplaced commas, apostrophes, and quotation marks.3. Evaluate the overall structure and organization of the essay, making sure each paragraph has a clear topic and supports the main thesis.4. Assess the use of vocabulary and language, considering whether the words chosen are appropriate for the context and target audience.5. Provide feedback on the clarity and coherence of the writing, offering suggestions for improving transitions between ideas and paragraphs.6. Offer constructive criticism on the content and development of the essay, identifying any areas that lack sufficient evidence or explanation.7. Encourage the use of varied sentence structures and lengths to create a more engaging and dynamic writing style.8. Comment on the effectiveness of the introduction and conclusion, noting whether they effectively capture the reader's attention and summarize the main points.9. Suggest revisions to improve the flow and rhythm of the writing, recommending changes to sentence and paragraph lengths as needed.10. Offer praise for strong points in the essay, suchas insightful analysis, original ideas, or compelling arguments.。

英语重点知识归纳

英语重点知识归纳

英语重点知识归纳以下是一些英语学习中的重点知识归纳,适用于不同年龄和水平的学习者:语法:1. 主语(Subject)和谓语(Verb)的基本概念,如主谓一致。

2. 时态(Tense):过去、现在、将来时态的构成和用法。

3. 名词(Noun):单数和复数形式,可数和不可数名词,所有格等。

4. 代词(Pronoun):主格、宾格、所有格等。

5. 动词(Verb):动作动词、助动词、情态动词,以及不同时态和语态的构成。

6. 形容词(Adjective)和副词(Adverb):描述名词和动词的词汇。

7. 介词(Preposition):用于表达位置、方向、时间等关系。

8. 连词(Conjunction):用于连接句子、短语或单词的词汇。

9. 句子结构:简单句、复合句、从句等。

词汇:10. 常见的英语单词,包括动词、名词、形容词和副词。

11. 基本的时间词汇,如日期、星期、季节等。

12. 常见的日常用语和礼貌用语,如问候、道歉、感谢等。

阅读和写作:13. 阅读理解:提高阅读理解能力,包括理解主旨、关键细节和推断意义。

14. 写作技巧:写句子、段落和短文,发展逻辑、结构和语法能力。

15. 词汇扩展:积累更多的词汇,以便更富有表现力地表达思想。

听力和口语:16. 听力技能:提高听力理解能力,包括理解口音和语速不同的说话者。

17. 口语表达:练习口语表达,提高发音和口音。

文化和交际:18. 了解英语国家的文化、传统和风俗,以便更好地理解和交流。

19. 礼仪和交际技巧:学会礼貌的交往方式,如问候、告别、感谢等。

补充学习:20. 阅读和听力材料:阅读书籍、新闻、杂志,听英语音频和视频材料以提高语言技能。

21. 语法和词汇练习:定期练习语法和词汇以巩固知识。

22. 语言学习应用:使用在线工具和应用程序来加强英语学习,如语言学习应用、在线字典等。

这些是英语学习中的一些关键知识点,无论是初学者还是有一定基础的学习者,都可以依照这些知识点逐步提高他们的英语技能。

语法重点梳理

语法重点梳理

语法重点梳理一、句子结构句子是最基本的语法单位,具有完整的意义。

句子的结构包括主语、谓语、宾语、状语等要素。

1. 主语(Subject):动作的执行者或事物的名称。

通常是名词、代词或名词性短语。

例:The cat is sleeping.(主语:The cat)2. 谓语(Predicate):句子中的核心动词,描述主语动作或状态的变化。

例:The student is studying.(谓语:is studying)3. 宾语(Object):接受动作的对象,通常是名词、代词或名词性短语。

例:She reads a book.(宾语:a book)4. 状语(Adverbial):修饰动词、形容词、副词的成分,用来说明时间、地点、方式、原因等。

例:He runs quickly.(状语:quickly)二、时态和语态时态和语态是语法中的重点部分,它们决定了动词的形式和句子的表达方式。

1. 时态(Tense):表示动作发生的时间,包括现在时、过去时和将来时等。

- 现在时:表示现在正在进行或经常发生的动作。

- 过去时:表示过去发生或已经完成的动作。

- 将来时:表示将来要发生的动作或存在的状态。

2. 语态(Voice):表示动作的主体与句子的主语之间的关系,包括主动语态和被动语态。

- 主动语态:表示主语是动作的执行者。

- 被动语态:表示主语是动作的承受者。

三、词类和词性词类和词性是语法中的基础概念,对于理解句子的结构和功能至关重要。

1. 名词(Noun):表示人、事物、地点、抽象概念等的名称。

- 具体名词:表示可以通过感官直接感知的事物,如dog(狗)、car(汽车)。

- 抽象名词:表示无法通过感官直接感知的事物,如happiness(幸福)、love(爱)。

2. 动词(Verb):表示动作、状态或存在。

- 及物动词:需要宾语才能完整句意的动词,如eat(吃)、write (写)。

- 不及物动词:不需要宾语即可完整句意的动词,如run(跑)、sleep(睡觉)。

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Verb Tense ConsistencyThroughout this document, example sentences with nonstandard or inconsistent usage have verbs in red.Controlling Shifts in Verb TenseWriting often involves telling stories. Sometimes we narrate a story as our main purpose in writing; sometimes we include brief anecdotes or hypothetical scenarios as illustrations or reference points in an essay. Even an essay that does not explicitly tell a story involves implied time frames for the actions discussed and states described. Changes in verb tense help readers understand the temporal relationships among various narrated events. But unnecessary or inconsistent shifts in tense can cause confusion. Generally, writers maintain one tense for the main discourse and indicate changes in time frame by changing tense relative to that primarytense, which is usually either simple past or simple present. Even apparently non-narrative writing should employ verb tenses consistently and clearly.General guideline: Do not shift from one tense to another if the time frame for each action or state is the same.Examples:1. The ocean contains rich minerals thatwashed down from rivers and streams.Contains is present tense,referring to a current state;washed down is past, but shouldbe present (wash down) becausethe minerals are currentlycontinuing to wash down.Corrected: The ocean containsrich minerals that wash downfrom rivers and streams.2. About noon the sky darkened, a breeze sprang up, and a low rumble announces the approaching storm.Darkened and sprang up are pasttense verbs; announces is presentbut should be past (announced)to maintain consistency withinthe time frame.Corrected:About noon the skydarkened, a breeze sprang up,and a low rumble announced theapproaching storm.3. Yesterday we had walked to school but later rode the bus home.Had walked is past perfect tensebut should be past to maintainconsistency within the time frame(yesterday); rode is past,referring to an action completedbefore the current time frame.Corrected:Yesterday wewalked to school but later rodethe bus home.General guideline: Do shift tense to indicate a change in time frame from one action or state to another.Examples:1. The children love their new tree house,which they built themselves.Love is present tense, referring toa current state (they still love itnow;) built is past, referring to anaction completed before thecurrent time frame (they are notstill building it.)2. Before they even began deliberations,many jury members had reached averdict.Began is past tense, referring toan action completed before thecurrent time frame; had reachedis past perfect, referring to actionfrom a time frame before that ofanother past event (the action ofreaching was completed beforethe action of beginning.)3. Workers are installing extra loudspeakers because the music in tonight's concert will need amplification.Are installing is presentprogressive, referring to anongoing action in the currenttime frame (the workers are stillinstalling, and have not finished;)will need is future, referring toaction expected to begin after thecurrent time frame (the concertwill start in the future, and that'swhen it will need amplification.)Controlling Shifts in a Paragraph or EssayGeneral guideline: Establish a primary tense for the main discourse, and use occasional shifts to other tenses to indicate changes in time frame.Hints:∙Rely on past tense to narrate events and to refer to an author or an author's ideas as historical entities (biographical information about a historical figure or narration of developments in an author's ideas over time). ∙Use present tense to state facts, to refer to perpetual or habitual actions, and to discuss your own ideas or those expressed by an author in a particular work. Also use present tense to describe action in a literary work, movie, or other fictional narrative.Occasionally, for dramatic effect, you may wish to narrate an event in present tense asthough it were happening now. If you do, use present tense consistently throughout the narrative, making shifts only where appropriate.Future action may be expressed in a variety of ways, including the use of will, shall, is going to, are about to, tomorrow and other adverbs of time, and a wide range of contextual cues.Using Other Tenses in Conjunction with Simple TensesIt is not always easy (or especially helpful) to try to distinguish perfect and/or progressive tenses from simple ones in isolation, for example, the difference between simple past progressive ("She was eating an apple") and present perfect progressive ("She has been eating an apple"). Distinguishing these sentences in isolation is possible, but the differences between them make clear sense only in the context of other sentences since the time-distinctions suggested by differenttenses are relative to the time frame implied by the verb tenses in surrounding sentences or clauses.Example 1: Simple past narration with perfect and progressive elementsOn the day in question...By the time Tom noticed the doorbell, ithad already rung three times. As usual,he had been listening to loud music onhis stereo. He turned the stereo down andstood up to answer the door. An old manwas standing on the steps. The manbegan to speak slowly, asking fordirections.In this example, the progressive verbs had been listening and was standing suggest action underway at the time some other action took place. The stereo-listening was underway when the doorbell rang. The standing on the steps was underway when the door was opened. The pastperfect progressive verb had been listening suggests action that began in the time frame prior to the main narrative time frame and that was still underway as another action began.If the primary narration is in the present tense, then the present progressive or present perfect progressive is used to indicate action that is or has been underway as some other action begins. This narrative style might be used to describe a scene from a novel, movie, or play, since action in fictional narratives is conventionally treated as always present. For example, we refer to the scene in Hamlet in which the prince first speaks (present) to the ghost of his dead father or the final scene in Spike Lee's Do the Right Thing, which takes place (present) the day after Mookie has smashed(present perfect) the pizzeria window. If the example narrative above were a scene in a play, movie, or novel, it might appear as follows.Example 2: Simple present narration with perfect and progressive elementsIn this scene...By the time Tom notices the doorbell, ithas already rung three times. As usual, hehas been listening to loud music on hisstereo. He turns the stereo down andstands up to answer the door. An old manis standing on the steps. The man beginsto speak slowly, asking for directions.In this example as in the first one, the progressive verbs has been listening and is standing indicate action underway as some other action takes place. The present perfect progressive verb has been listening suggests action that began in the time frame prior to the main narrative time frame and that is still underway as another action begins. The remaining tense relationships parallel those in the first example.In all of these cases, the progressive or -ing part of the verb merely indicates ongoing action, that is, action underway as another action occurs. The general comments about tense relationships apply to simple and perfect tenses, regardless of whether there is a progressive element involved.It is possible to imagine a narrative based on a future time frame as well, for example, the predictions of a psychic or futurist. If the example narrative above were spoken by a psychic, it might appear as follows.Example 3: Simple future narration with perfect and progressive elementsSometime in the future...By the time Tom notices the doorbell, itwill have already rung three times. Asusual, he will have been listening to loudmusic on his stereo. He will turn thestereo down and will stand up to answerthe door. An old man will be standing onthe steps. The man will begin to speakslowly, asking for directions.In this example as in the first two, the progressive verbs will have been listening and will be standing indicate ongoing action. The future perfect progressive verb will have been listening suggests action that will begin in the time frame prior to the main narrative time frame and that will still be underway when another action begins. The verb notices here is in present-tense form, but the rest of the sentence and the full context of the narrative cue us to understand that it refers to future time. The remaining tense relationships parallel those in the first two examples.General guidelines for use of perfect tensesIn general the use of perfect tenses is determined by their relationship to the tense of the primary narration. If the primary narration is in simple past, then action initiated before the time frame of the primary narration is described in past perfect. If the primary narration is in simple present, thenaction initiated before the time frame of the primary narration is described in present perfect. If the primary narration is in simple future, then action initiated before the time frame of the primary narration is described in future perfect.Past primary narration corresponds toPast Perfect(had+ past participle) forearlier time framesPresent primary narration corresponds toPresent Perfect(has or have+ pastparticiple) for earlier time framesFuture primary narration corresponds toFuture Perfect(will have+ pastparticiple) for earlier time framesThe present perfect is also used to narrate action that began in real life in the past but is not completed, that is, may continue or may be repeated in the present or future. For example: "I have run in four marathons" (implication: "so far... I may run in others"). This usage is distinctfrom the simple past, which is used for action that was completed in the past without possible continuation or repetition in the present or future. For example: "Before injuring my leg, I ran in four marathons" (implication: "My injury prevents me from running in any more marathons").Time-orienting words and phrases like before, after, by the time, and others--when used to relate two or more actions in time--can be good indicators of the need for a perfect-tense verb in a sentence.By the time the Senator finished (past) hisspeech, the audience had lost(pastperfect) interest.By the time the Senator finishes (present:habitual action) his speech, the audiencehas lost (present perfect) interest.By the time the Senator finishes (present:suggesting future time) his speech, theaudience will have lost(future perfect)interest.After everyone had finished (past perfect) the main course, we offered(past) our guests dessert.After everyone has finished(present perfect) the main course, we offer (present: habitual action) our guests dessert.After everyone has finished(present perfect) the main course, we will offer (future: specific one-time action) our guests dessert.Long before the sun rose (past), the birds had arrived (past perfect) at the feeder. Long before the sun rises(present: habitual action), the birds have arrived (present perfect) at the feeder.Long before the sun rises(present: suggesting future time), the birds will have arrived(future perfect) at the feeder.Sample paragraphsThe main tense in this first sample is past. Tense shifts are inappropriate and are indicated in bold.The gravel crunched and spatteredbeneath the wheels of the bus as it swunginto the station. Outside the window,shadowy figures peered at the busthrough the darkness. Somewhere in thecrowd, two, maybe three, people werewaiting for me: a woman, her son, andpossibly her husband. I could not preventmy imagination from churning out apicture of them, the town, and the place Iwill soon call home. Hesitating a moment,I rise from my seat, these images flashingthrough my mind. (adapted from anarrative)Inappropriate shifts from past to present, such as those that appear in the above paragraph, are sometimes hard to resist. The writer becomes drawn into the narrative and begins to relive theevent as an ongoing experience. The inconsistency should be avoided, however. In the sample, will should be would, and rise should be rose.The main tense in this second sample is present. Tense shifts--all appropriate--are indicated in bold.A dragonfly rests on a branchoverhanging a small stream this Julymorning. It is newly emerged from brownnymphal skin. As a nymph, it crept overthe rocks of the stream bottom, feedingfirst on protozoa and mites, then, as itgrew larger, on the young of otheraquatic insects. Now an adult, it will feedon flying insects and eventually willmate. The mature dragonfly iscompletely transformed from the drabcreature that once blended withunderwater sticks and leaves. Its head,thorax, and abdomen glitter; its wings areiridescent in the sunlight. (adapted froman article in the magazine Wilderness)This writer uses the present tense to describe the appearance of a dragonfly on a particular July morning. However, both past and future tenses are called for when she refers to its previous actions and to its predictable activity in the future.。

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