四级语法特训(六)

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专业英语四级(语法与词汇)模拟试卷6(题后含答案及解析)

专业英语四级(语法与词汇)模拟试卷6(题后含答案及解析)

专业英语四级(语法与词汇)模拟试卷6(题后含答案及解析)题型有: 4. GRAMMAR & VOCABULARYPART IV GRAMMAR & VOCABULARY (15 MIN)Directions: There are thirty sentences in this section. Beneath each sentence there are four words or phrases marked A, B, C and D. Choose one word or phrase that best completes the sentence.1.He didn’t invite us in______words, he just asked whether we were coming.A.such manyB.so manyC.many aD.such a正确答案:B解析:该题是语法结构题,考查so many/much+名词结构的用法。

当名词前面有表示数量的词语(如many,much,few,little等)时,只能用so来修饰,不能用such,如:They have only so much time to do their lessons.他们只有这么些时间来做作业。

选项C和选项D后面均要求用可数名词单数形式。

因此,根据题意和语法规则,选项B为最佳答案。

知识模块:语法与词汇2.______from Mary for a long time, Tom wrote to her again.A.Having not heardB.Not having heardC.Haven’t heardD.Not to have heard正确答案:B解析:该题是语法结构题,考查动词非谓语形式中现在分词的用法。

在该题中,现在分词要用完成形式,表示原因;表示否定意义的助动词not要放在分词前面。

大学英语四六级语法专项练习与答案

大学英语四六级语法专项练习与答案

大学英语四六级语法训练大学英语四六级语法训练及答案解析一 . 定语从句专项练习1. The tree, the branches _________ are almost bare, is a very old one.A. whoseB. in whichC. of whichD. which2.We ’ ll never forget the day in 1997 __________ Hong Kong held agrand ceremony marking the handover from Britain to China.A. whenB. thatC. whichD. as3.Who is the lady _________ is waving to you?A. whichB. thatC. whoD. whom4.It was not ________ late at night that we found our lost sheep.A. whenB. unlessC. untilD. while5.The size of the audience, ________ I had expected, was well overten thousand.A. whomB. asC. thatD. who6.Edward is the boy _____ I think scored the winning points forthe basketball team.A. whomB. thatC. whichD. who7.________ the people have become masters of their own country ________science can really serve them.A. It is only then/ thatB. It is only when/ thatC. It was that/ whenD. It was when/ then8. My neighbors on either side of me have painted their houses, ________of course makes my house look shabbier than it really is.A. thatB. asC. whoD. which9. John helped me clean my car _________ was very kind of him.A. and thisB. and thatC. itD. which10. He invested his money in many companies, ____went bankrupt within5 months.A. of whichB. three of whichC. thatD. three of that11. These two areas are similar ____they both have a high rainfallduring this season.A. to thatB. besides thatC. in thatD. except that12. The man, _____we met in the street, came from Haiti.A. thatB. whoC. whoseD. which13. Can you solve such problems _______ raised by the audience?A. what wereB. as wereC. which wereD. that were14. It wasn’ t such a good film she had promised.A. asB. thatC. whatD. like15. There was not a hut in the village _______ he had not brought foodand comfort.A. whichB. to whichC. in whichD. that16. This is the book ________ I was telling you just now.A. about thatB. in thatC. in whichD. about which17. Both the director and the film _____ you’ ve just talked about are very famous.A. whoseB. whichC. whomD. that18.Her father, _______ was lately dead, had left her a large property.A. heB. thatC. whichD. who19.This is the third time we ________ improvements in that equipment.A. are makingB. madeC. have madeD. will make20.All that can be done ______________.A. have been doneB. have doneC. has been doneD. has doneKeys:1. C2. A3.B4.C5.B6.D7. B8. D9.D 10.B 11.C 12.B13. B14. A15. B 16. D 17. D18. D19. C20. C二 .虚拟语气专练1.______ go down town this afternoon, please post the letter for me.A. Had youB. Were you toC. If you didD. Shall you2.You didn ’ t let me drive. If we ______ in turn, you ______ so tired.A. drove, didn’ t getB. were driving, wouldn’ t get’ t get D. had driven, wouldn’ t have gotC. drove, wouldn3.If it ______ for the snow, we _______ the mountain yesterday.A. were not, could have climbedB. were not, could climb’ t been, could climbC. hadn ’ t been, could have climbedD. hadn4.The new airport _______ if they had not stopped working on it.A. would completeB. had been completedC. had completedD. would have been completed5.If he _______ his doctor’ s advice, he ________ alive.A. had taken, might still have beenB. had taken; might still beC. might have taken; had still beenD. took; might still be6.If you ______ in good health, I _______ you go on a trip yesterday.A. were; would have letB. had been; would have letC. had been; had letD. were; had let7.I lost your address, otherwise (or) I _________ you long before.D. should visitA. had visitedB. have visitedC. would have visited8.The guard at the gate insisted that everybody _______ the rules.A. obeysB. obeyC. will obeyD. would obey9.The boss insisted that John ________ unfit for his work.A. wasB. isC. should beD. were10. The officer commanded (ordered) the damaged bridge ____ before dawn.A. must be repairedB. would be repairedC. be repairedD. should have been repaired11. He suggested (advised, proposed) that the wounded _______ tothe hospital as soon as possible.A. had been sentB. should have been sentC. would be sentD. (should) be sent12. He came home with a smile on his face, which suggested that he __ work.A. should findB. had lostC. should have foundD. had found13. Most of the members demanded (requested, required, asked) thatthe meeting ________ till after Friday.A. shouldn’ t put offB. not be put offC. wouldn ’ t be put offD. not put off14. I wish I ________ how to translate this sentence.A. knewB. knowC. have knownD. should know15. –Has Fangfang been to New York?--No, but she wishes she _____.A. wouldB. will next timeC. hadD. had next time16. I wish I _______ the TV program last night.A. could watchB. have watchedC. watchedD. could have watched17. The two strangers talked as if they ______ fiends for years.A. should beB. would beC. have beenD. had been18. When a pencil is partly in a glass of water, it looks as if (though) it_______.A. breaksB. has brokenC. were brokenD. has been broken19. Look at the clouds, it looks as if it _______ rain.A. willB. wouldC. wereD. is going to20. _______ he were trying to teach them all he knew.A. It seemed thatB. They had hopedC. It seemed as ifD. They thoughtKeys:1.B2.D3.C4. D5. B6.B7.C8.B9. A 10. C 11. D 12. D 13.B 14.A15.C16. D17.D18.C 19. D20. C三 .倒装句专项练习1.You often read China Daily. ________ .A. So am IB. So do IC. Nor do ID. Neither can I2.________ find out what happened.A. Until he woke up did heB. Until he woke up toC. Not until did he wake up, heD. Not until he woke up did he3._________ got into the room _______ the telephone rang.A. No sooner had he; whenB. He hardly had; thenC. Hardly had he; whenD. He hardly had; than4.Little _______ about his own health though he was very ill.A. he caredB. he caresC. does he careD. did he care5.________, you would have met him.A. If you were thereB. Should you been thereC. If you went thereD. Had you been there6.Seldom _________ such a funny story as he told us.A. have I heardB. I have heardC. did I listenD. I listened7.So loudly _______ that all the people in the room got a fright.A. he shoutedB. shout heC. did he shoutD. he did shout8.Rarely _______ so difficult a problem.A. she could have faced withB. could have she faced withC. she could have been faced withD. could she have been faced with9.Not a single mistake _______ in the test.A. he madeB. did he makeC. he has madeD. made he10. Hardly _______ the classroom when the class began.A. had he enteredB. he had enteredC. he enteredD. he was entered11.____ France Viuard an excellent political speaker but she was also among the first members of the Democratic Party.A. Not onlyB. If onlyC. OnlyD. Not only was12. _________ should any money be given to a small child.A. On no accountB. From all accountsC. Of no accountD. By all accounts13. So badly ________ in the accident that Simon was delayed in thehospital for treatment.A. did he injureB. he injuredC. was he injuredD. he was injured14. ___________ that they may eventually reduce the amount oflabor needed on construction sites by 90 percent.A. So clever are the construction robotsB. So clever the construction robots areC. Such construction robots are cleverD.Such clever construction robots are15. ________ do we suspect that this district is rich in mineral resources.A. LittleB. A littleC. FewD. A few16. We have done things we ought not to have done and ________undone things to we ought to have done.A. leavingB. will leaveC. leftD. did leave17. _________ no computers, there could have been no satellites or rockets.A. Had there beenB. If there wereC. Should there beD. If there are18. Only after many years of hard work _______ that money alone doesnot lead to happiness and success.A. did I realizeB. I did realizeC. had I realizedD. I had realized19. ___________, but I still like him.A. Selfish though he isB. Selfish as he isC. Selfish he may beD. Whether he is selfish or not20. ___________, I couldn’ t lift the box.A. As I might tryB. Try as I mightC. As try I mightD. Though try I mightKeys: 1. B 2. D 3. C 4.D 5.D 6.A7. C8.D9. B 10. A 11.D 12.A 13.C14. A15. A16. C 17. A18. A19.C20. B四 .非谓语动词专练从 A 、B、C、 D 四个选项中,选出可以填入空白处的最佳选项。

四级语法考点详解与练习

四级语法考点详解与练习

四级语法考点详解与练习语法在英语学习中占据着重要的地位,它是理解和运用英语的基础。

四级考试中,语法是必考的一部分,因此我们有必要对四级考试中常见的语法知识点进行详细的解析,并提供相应的练习题,以帮助大家更好地掌握语法知识,为考试做好充分的准备。

一、动词时态和语态动词时态和语态是四级考试中经常考察的重点,掌握好动词时态和语态的用法对于正确理解句子的意思至关重要。

下面我们就来详细解析一下动词时态和语态的用法。

1. 一般现在时一般现在时表示经常性的、习惯性的动作或存在的状态。

例如:Igo to school every day.(我每天去上学)2. 一般过去时一般过去时表示过去某个时间发生的动作或存在的状态。

例如:He played basketball yesterday.(他昨天打篮球)3. 现在进行时现在进行时表示现在正在发生的动作。

例如:They are studying inthe library.(他们正在图书馆学习)4. 过去进行时过去进行时表示过去某个时间正在进行的动作。

例如:He was watching TV when I called him yesterday.(我昨天给他打电话的时候,他正在看电视)5. 现在完成时现在完成时表示过去发生的动作对现在产生的影响或结果。

例如:I have finished my homework.(我已经完成了我的作业)6. 过去完成时过去完成时表示在过去某个时间之前已经发生的动作。

例如:He had already left when I arrived.(我到达时,他已经离开了)7. 一般将来时一般将来时表示将来某个时间要发生的动作。

例如:I will go to the movie with you tomorrow.(我明天会和你一起去看电影)8. 情态动词情态动词表示说话人对某种情况的看法、态度或做事情的能力等。

例如:She can swim.(她会游泳)二、被动语态和虚拟语气被动语态和虚拟语气同样也是四级考试中常考的考点,下面我们来详细解析一下这两个语法知识点的用法。

语法实战四级语法备考实战训练

语法实战四级语法备考实战训练

语法实战四级语法备考实战训练第一部分:基础知识回顾在备考四级语法考试之前,我们首先需要回顾一些基础知识。

以下是一些常见的语法规则,对于备考四级语法考试非常重要。

1. 主谓一致:主语和谓语动词在人称和数上保持一致。

例如:- The dog barks.(单数主语)- The dogs bark.(复数主语)2. 时态和语态:根据句子的时间和动作的主体来选择适当的时态和语态。

例如:- The concert will be held tonight.(将来时态)- The window was broken by the children.(被动语态)3. 代词的使用:代词在句子中替代名词,以避免重复。

例如:- He loves playing basketball, and he plays it every day.→ He loves playing basketball, and he plays it every day.- Mary bought a new car. The car is red.→ M ary bought a new car. It is red.第二部分:实战训练现在,我们将通过一些实战训练来巩固这些语法知识。

请根据下面的句子,选择适当的词或短语来完成句子。

1. I ____________ to the library every week to borrow books.(go/goes)2. I ____________ my best friend yesterday.(see/saw)3. The concert ____________ by a famous singer next month.(will be held/held)4. Ann and her brother ____________ at the park yesterday.(play/played)5. My parents ____________ living in this city for over 20 years.(have been/were)第三部分:综合应用现在让我们来进行一些综合应用题,通过完整的句子来实践以上所学的语法规则。

(简明版)大学英语四级语法大全

(简明版)大学英语四级语法大全

(简明版)大学英语四级语法大全一、名词(Noun)名词是一个词汇类别,用于表示人、动物、事物、地点等。

在句子中,名词可以作为主语、宾语、定语、表语等。

例如:- 主语:Cats are cute animals.Cats are cute animals.- 宾语:I love dogs.dogs.- 定语:The green tree is beautiful.green tree is beautiful.- 表语:My brother is a doctor.doctor.二、代词(Pronoun)代词是一个词汇类别,用于替代名词。

它们可以替代特定的人或事物,以避免重复使用相同的名词。

例如:- 人称代词:I am going to the store.I am going to the store.- 物主代词:That book is mine.mine.- 指示代词:This is my car.This is my car.- 相互代词:They saw each other at the party.each other at the party.三、形容词(Adjective)形容词是用于描述名词或代词的词汇。

它们可以提供关于名词或代词的特征、性质、状态等信息。

例如:- 描述名词:She has a beautiful voice.beautiful voice.- 描述代词:I am so tired.so tired.- 修饰词组:He bought a red sports car.red sports car.四、副词(Adverb)副词是用于描述动词、形容词、其他副词或整个句子的词汇。

它们可以提供关于时间、地点、程度等信息。

例如:- 描述动词:She sings beautifully.beautifully.- 描述形容词:He is extremely tall.extremely tall.- 描述副词:She runs very fast.very fast.- 描述整个句子:Certainly, I can help you.Certainly, I can help you.五、动词(Verb)动词是用于表示动作、状态或发生事件的词汇。

2019英语四级考试语法知识详解(6)

2019英语四级考试语法知识详解(6)

2019英语四级考试语法知识详解(6)
句子成分(members of the sentence)
英语的句子由主语部分与谓语部分组成。

具体地讲,主要有下列
六种句子成分:
1)主语(subject)它是句子所要说明的人或事物,是一句的主体。

如I study English(我学习英语)中的I。

2)谓语动词(predicate verb)它是说明主语的动作或状态的,如
I study English中的study。

3)表语(predicative)它是放在连系动词之后表示主语的身分或
特征的,如I am a student(我是一个学生)中的student;Our classroom is clean(我们的教室很干净)中的clean。

4)宾语(object)它是表示及物动词动作的对象的,如I study English中的English。

介词后面的名词或代词,叫做介词的宾语,如They don't work on Sunday(他们星期天不工作)中的Sunday,就是介词on的宾语。

5)定语(attribute)它是限定或修饰名词或代词用的,如He
likes to drink co1d milk(他喜欢喝冷牛奶)中的co1d。

6)状语(adverbial)它是修饰动词、形容词、副词用的,如He works hard(他努力工作)中的hard。

[注]虚词在句子中一律不能作为句子成分。

CET4语法考点全解析

CET4语法考点全解析

CET4语法考点全解析在准备英语四级考试的过程中,语法一直是考生们比较头疼的一个部分。

由于语法知识点众多,考试时往往容易混淆,因此,了解并掌握每个语法考点是非常重要的。

本文将对CET4考试中常见的语法考点进行全面解析,帮助考生在备考中有针对性地进行复习。

一、冠词冠词是英语中一种常见的虚词,包括定冠词“the”和不定冠词“a/an”。

定冠词“the”表示特指,常用于特定的人、事物或概念;不定冠词“a/an”表示泛指,常用于不特定的人、事物或概念。

在考试中,考生需要注意正确使用冠词,避免使用错误或遗漏。

二、时态英语时态是考试中的重要考点之一,主要包括一般现在时、一般过去时、一般将来时、现在进行时、过去进行时、过去将来时等。

考生需要根据句意和语境选择正确的时态,避免时态错误导致句子不通顺或不符合语法规则。

三、名词名词是英语中一种表示事物、人或概念的词汇,可分为可数名词和不可数名词。

在考试中,考生需要注意名词的单复数形式、所有格形式以及名词性从句的使用,避免在句子中出现名词错误。

四、动词动词是英语中一种表示行为或状态的词汇,主要包括一般动词、情态动词、动词的时态和语态等。

在考试中,考生需要注意动词的时态和语态的正确使用,避免主谓不一致或动词形式错误。

五、代词代词是英语中一种用来代替名词或其他词汇的词汇,包括人称代词、物主代词、反身代词等。

在考试中,考生需要注意代词的正确使用,避免在句子中出现代词错误或误解。

六、连接词连接词是英语中一种用来连接句子、短语或词汇的词汇,包括并列连词、从属连词和连接副词等。

在考试中,考生需要注意连接词的使用,保持句子逻辑性和通顺性。

七、介词介词是英语中一种用来表示位置、方向或关系的词汇,包括时间介词、地点介词和方式介词等。

在考试中,考生需要注意介词的正确使用,避免在句子中出现介词错误或误解。

总结:通过上述对CET4语法考点的全面解析,考生可以更好地理解和掌握英语语法知识,提高语法水平和应试能力。

四六级语法练习题精选

四六级语法练习题精选

四六级语法练习题精选在备考四六级英语考试时,语法是一个十分重要的部分。

良好的语法掌握能够确保我们在写作和阅读理解中的准确性和流畅度。

为了帮助大家更好地备考,下面选取了一些四六级语法练习题,希望能对大家有所帮助。

练习一:选词填空1. It's important for us to ________ a positive attitude towards life.A. adoptB. adaptC. acceptD. affect2. ________ animals in the zoo, the children were excited and couldn't wait to see them.A. SightseeingB. SeeingC. To seeD. Seen3. The teacher ________ her students to hand in their homework on time.A. expectsB. hopesC. asksD. orders4. She has been studying English ________ she started primary school.A. becauseB. whileC. sinceD. as5. My father doesn't allow me to ________ TV for more than two hoursa day.A. watchB. lookC. seeD. observe答案:1. A 2. B 3. A 4. C 5. A练习二:语法选择Today, I'd like to ________ with you an interesting story about how I ________ my childhood dream.When I was young, I always ________ about becoming a writer. I used to write stories and poems in my journal ________ I felt inspired. However, as I grew older, I ________ interested in other things and slowly ________ up on my dream.But one day, while I ________ in the library, I ________ across a book that ________ me of my childhood dream. I ________ it up and started reading. As I read, I ________ a sense of excitement and inspiration that I hadn't felt in a long time.From that day on, I ________ writing again. I ________ myself a schedule and ________ to write for at least an hour every day. Slowly, I________ my skills and started sharing my work with others. ________, my dream became a reality.1. A. share B. present C. express D. make2. A. achieved B. reached C. fulfilled D. accomplished3. A. dreamed B. hoped C. wondered D. thought4. A. where B. while C. what D. when5. A. lost B. found C. gained D. missed6. A. gave B. handed C. took D. turned7. A. sit B. sit down C. was sitting D. seated8. A. come B. went C. moved D. passed9. A. reminded B. mentioned C. told D. informed10. A. picked B. took C. held D. carried11. A. felt B. sensed C. realized D. noticed12. A. started B. began C. continued D. resumed13. A. set B. made C. created D. formed14. A. developed B. progressed C. improved D. enhanced15. A. Finally B. Eventually C. Firstly D. Gradually答案:1. A 2. C 3. A 4. D 5. A 6. C 7. C 8. B 9. A 10. B 11.A 12.B 13. A 14.C 15. B练习三:改错题1. Computers is becoming more and more important in our daily life.错误:is 纠正:are2. The teacher needs to know how are the students feeling about the assignment.错误:are 纠正:the3. He didn't write either the date or his name on the paper.错误:the 纠正:a4. They have gone to the shopping mall last night.错误:gone 纠正:went5. It was not difficult to fix the problem if you follow the instructions carefully.错误:follow 纠正:followed答案:1. Computers are becoming more and more important in our daily life.2. The teacher needs to know how the students are feeling about the assignment.3. He didn't write either the date or a name on the paper.4. They went to the shopping mall last night.5. It was not difficult to fix the problem if you followed the instructions carefully.以上是一些四六级语法练习题的精选,希望能够帮助大家在备考过程中更好地掌握语法知识。

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四级语法特训(六)八状语从句状语从句:两个独立的句子中间用一些含义不同的连接词连接;状语从句用来表达两个句子之间的逻辑关系;分成原因状语、条件状语、结果状语、时间状语、地点状语、让步状语、目的状语、比较状语、方式状语等九大类型;eg:I got up late.I was late for school.Because I got up late, I was late for school. (原因状语从句)I got up late,so I was late for school. (结果状语从句)1.地点状语:地点状语从句通常由where, wherever,everywhere 引导;eg:Where I live there are plenty of trees.Wherever you work, you will gain much valuable experience as long as you are willing to work.Wherever=no matter whereEverywhere they went, they were warmly received.Where there is a will, there is a way.where:不能翻译成在……地方时,通常翻译为如果,表示在……条件下;eg: Where you are confident,you will succeed.eg:Where previously the bank had concentrated on the big infrastructure projects , such as dams, roads and bridges,it begin to switch to projects which directly improved the basic services of a country.concentrated on :集中于;2. 方式状语从句:方式状语从句通常由as,,as if, as though,the way, what引导;eg:Always do to the others as you would be done by.When enter rome do as the romans do .(1)as从句带有比喻的含义,意思是"正如…","就像";(2)as if/though:"仿佛……似的","好像……似的";有时用虚拟语气,有时不用;eg:They completely ignore these facts as if (as though) they never existed.(与事实相反,谓语用虚拟语气。

)He looks as if (as though) he had been hit by lighting.(与事实相反,谓语用虚拟语气。

)It looks as if the weather may pick up very soon.(实现的可能性较大,谓语用陈述语气。

)(3)the way:可以连接两个句子,表达就像……一样;eg:I should do the job the way my father did.Many Europeans now apparently view the US. the way many Americans view Mexican as a cheap place to vacation, shop and party.(4)what:就像,犹如;eg:Air is to man what/as water is to fish.句型:A is to B what C is to D.eg:A1 Gore calls global warming an "inconvenient truth," as if merely recognizing it could put us on a path to a solution.put sb. on a path to a solution:找到解决的办法;3. 目的状语从句可以由that, so that, in order that, lest, for fear that, in case等词引导;lest:以防;从句中的谓语动词必须用should+动词原形;eg: He wrote the name down for fear that(lest) he should forget it.He took the umbrella with him lest it should rain.in case:以防;与lest不同,从句里的时态不做特殊变化;eg:Take the umbrella with you in case it rains.for feat that:和lest保持一致;eg:A variety of activities should be organized so that participants can remain active as long as they want and then go on to something else without feeling guilty and without letting the other participants down.let…down…:让……感到气馁;4. 结果状语从句结果状语从句常由so…that 或such…that引导;so保留,that可以省略;如此……以至于……;eg:He didn't abide by the contract so that he was fined.He was so excited that he couldn't fall asleep.He made such an inspiring speech that everybody got excited.比较:so和such(1)so:so +形容词、副词+that;so+形容词+a/an+名词+that;eg:The wind was so strong that we could hardly move forward.He run so fast that I couldn't catch up with him.It was so hot a day that crops wilted.He is so lovely a boy that everyone loves him.(2)such:such+a/an+形容词+名词+thateg:It was such a hot day that crops wilted.He is such a lovely boy that everyone loves him.5. 比较状语从句:than, as…as…,not so as…,(not) the same as, the+比较级;eg:Light travels fast than sound.the+比较级:eg:The sooner,the better.eg:Girls are thus seen as less valuable than boys and art kept at home to do housework while their brothers are sent to school - the prophecy(预言) becomes self- fulfilling, trapping women in a vicious circle (恶性循环) of neglect.(1)当……的时候:while, when, as ;when:强调一件事情正在发生的时候,另外一件事情突然发生;eg:When I was watching TV, my mother came back.while:强调两个动作同时进行,一边……一边……;eg:My father is cooking while my mother is reading newspaper.as:"随时间推移"eg:As time went by, the days became longer and longer.(2)一……就……:as soon as ,主将从现;用directly,immediately, instantly连接两个句子;一些名词如the minute,the moment, the instant也可表示;no sooner…than, hardly…when 后面的句子需要倒装;eg:I will write to you the moment/minute I arrived in Paris.(3)特殊单词:by the time that, every/each time(使用时后面不要再加when)(4)till&until:①肯定形式表示的意思是"做某事直至某时",动词必须是延续性的;否定形式表达的意思是"直至某时才做某事",一般用until,动词为延续性或非延续性都可以;eg: I slept until midnight.Wait till I call you.She didn't arrive until 6 o'clock.②Until可用于句首,而till通常不用于句首,通常用于句中;eg: Until you told me, I had heard nothing of what happened.eg:As you sleep you pass through a sequence of sleep states—light sleep, deep sleep and REM (rapid eye movement) sleep—that repeats approximately every 90 minutes.7. 条件状语从句:(1)连接词:if, once, as long as, on condition that①如果引导的条件可以实现,主将从现;②如果引导的条件和事实相反,则用虚拟语气;eg:If winter comes can spring be far behind.As long as it doesn't rain, we can play.You can go out on condition that you wear an overcoat.Modern cars are far tougher to steal, as their engine management computer won't allow them to start unless they receive a unique ID code beamed out by the ignition (点火) key.8. 原因状语从句连接词:because, since, as, for ,now that, in that, owing to, due to, thanks to, because of , as a result of;比较:because, since, as和for1)because语势最强,用来说明人所不知的原因,回答why提出的问题。

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