高中英语语法---条件状语从句讲解
条件状语从句
概念定义
由引导词if或unless引导的状语从句叫做条件状语从句。在英文中，条件是指某一件事情实现之后（状语从句中的动作），其它事情（主句中的动作）才能发生，通常译作“假如”。（注意：在含有条件状语从句的复合句中，表示将来时态，主句是一般将来时态,祈使句或情态动词，从句要用现在时态,[主将从现原则]（主将从现，将并非指将来时，还指表示将来含义的，跟着if后的那句话是从句。）
类型
条件状语从句
语法引导条件状语从句最常用的连词是if,由if引导的条件状语从句表示在某种条件下某事很可能发生。如：
1） If you ask him,he will help you.
如果你请他帮忙，他会帮你的。
2） If you fail in the exam,you will let him down.
如果你考试不及格，你会让他失望的
if引导的条件状语从句既可以将从句放前面也可以将从句放后面
（如果天下雨，我们就不玩了）If it rains,we will stop playing.‘
转为We will stop playing if it rains.
if引导的条件状语从句
另外，if从句还表示不可实现的条件或根本不可能存在的条件，也就是一种虚拟的条件或假设，从句多用一般过去时或过去完成时。如：If I were you,I would invite him to the party.如果我是你，我会邀请他参加聚会。I would have arrived much earlier if I had not been caught in the traffic.如果没有堵车，我会到的早一点儿。
那么，除了if之外，是否还有其他连词也可以引导条件状语从句呢?回答是肯定的，不仅有，还有很多。这些词由于出现的频率较小，且用法较复杂一些，所以不如if为大家所熟知罢了。下面就这些词的用法以例句的形式进行一下简单总结。
1、unless conj.除非，若不，除非在……的时候
You will fail to arrive there in time unless you start earlier.如果你不早点动身，你就不能及时赶到那儿。
Unless it rains,the game will be played.除非下雨，比赛将照常进行。
2、on condition(that)...在……条件下，如果 on condition (that)...引导的条件从句是主句事件发生的前提条件或唯一条件。
I can tell you the truth on condition that you promise to keep a secret.我可以告诉你真相，条件是你答应保密。
You can go swimming on condition (that) you don't go too far from the river bank.你只有在不远离河岸的条件下才可以下水游泳。
3、supposing conj.如果，假如 supposing引导的条件从句表示一种假设条件。
Supposing it rains,shall we continue the sports meeting?倘若下雨，我们的运动会还要继续举行吗?
Supposing anything should go wrong,what would you do then?假如出了什么问题，你准备怎么对付?
英语语法专题条件状语从句(讲解+练习,无答案)
中考语法专题条件状语从句（讲解+练习，无答案）
条件状语从句
常用引导词：if, unless, as/so long as
1、if 从句 + 祈使句，“如果……，就……”
If you do not feel well, please go to see the doctor. 如果你感觉不舒服，就去看医生 吧。
If you want to know more about it, call now. 如果你想了解更多内容，现在就打电话 吧。
Make sure you visit the Science Museum if you ever go to London. 如果你去伦敦，一 定要去参观科学博物馆。
2、主将从现
If I start after dinner, I’ll finish it before I go to bed. 如果我晚饭后开始，睡觉前我就能 完成。
主句也可用“情态动词 + 动词原形” She may come with us if she arrives in time. 如果她来得及时，就可以和我们一起去。
3、if 条件状语从句和并列句的转换
Hurry up, or you’ll be late. = If you don’t hurry up, you’ll be late. Study hard and you will pass the exam. = If you study hard, you will pass the exam. 练习 （一）句型转换 1. Run fast, or you’ll be late for school. _______ you _______ _______ fast, you’ll be late for school. 2. You can buy the dictionary if you take enough money with you. Take enough money with you, _______ _______ _______ buy the dictionary. 3. If there is no air, none of us can live. None of us can live _______ _______.
4、unless “除非”
Don’t leave the building unless I tell you to. 不要离开大楼，除非我准许。 Unless you have finished your homework, I won’t allow you to watch TV. 除非你已完成 了作业，否则我是不会让你看电视的。 unless = if not You’ll be late if you don’t hurry. = You’ll be late unless you hurry. I can’t catch the train if I don’t get up early. = I can’t catch the train unless I get up early.
练习
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高中英语语法——冠词用法归纳
冠词 不定冠词的用法及语法说明 1. 用a 还是用an： 一般说来，在辅音或半元音开头的词前用a, 而在元音开头的词前用an。 注意： 有些以元音字母开头的单词，由于第一个音不是元音而是辅音，其前仍用a 而不用an： a one-eyed man 一个独眼人 a European country 一个欧洲国家 2. 单数可数名词若泛指，其前需加a ，an, 不要从汉语习惯出发，漏掉此不定冠词： He is a famous film star. 他是著名影星。 3. 专有名词转化为普通名词，其前可用a (an)，表示某某人或某某人的一部作品、艺术品等： a Mr Smith 一位名叫史密斯先生的人 4. 物质名词转化为普通名词，其前可以使用a (an)，有时表示相应产品或种类，有时表示数量关系： a good wine 一种好酒 5. 在序数词之前使用a (an)，可以表示数量或序数的增加： Soon I saw a second plane. 不久我又看到了一架飞机。 6. 与形容词的最高级连用，表示“非常”、“很”等： This is a almost interesting story. 这是一个非常有趣的故事。 7. 用于修饰名词的定语前，表示某种状态。此时的不定冠词含有类似a kind of 的意思： climate 气候→a mild climate 温和的气候 have breakfast 吃早餐→have a quick breakfast吃快餐 8. 不定冠词a (an) 与数词one 都可表示“一”，但是两者有差别： 不定冠词 a (an) 表示“类别”概念，而数词one 表示“数量”概念
高中英语二轮复习语法---冠词讲解
高三二轮语法复习——冠词 一、定冠词the 1.特指。(说话双方都知道的人或事物。上文提到的人或事物。有修饰限定的词。) I ate a sandwich while I was waiting for the 20:08 train. I like the color of your skirt. It’s a good match for your blouse. I have learned that it’s taking a long time to become the person I want to be. 2.与名词相关的特殊用法 1）世界上独一无二的事物 the universe ; the sun ; the moon 2）发明物 Alexander Graham Bell invented the telephone in 1876. 3）乐器（中国民族乐器除外） play the violin 4）身体部位（固定搭配） hit/strike sb on the head hit/strike sb in the face seize/take sb by the arm be red in the face / be lame in the right leg / be blind in the left eye 5）方位名词 The North is colder than the South. To the northeast of Nanjing lies Yangzhou. 6）计量单位 by the hour / day / dozen / pond / yard As a rule, domestic servants doing odd jobs are paid by the hour. 特例：by weight / size/ time Meat is sold by weight.
初中英语条件状语从句语法点和习题
1．常用引导词：if（如果），unless（除非）。 I won’t go to the movies unless I am free tomorrow. 除非我明天有空，否则我不会去看电影。 2．条件状语从句的位置 可放在句首或句尾，放在句首时常用逗号与主句隔开。 it rains tomorrow, I will stay at home. = I will stay at home if it rains tomorrow. 如果明天下雨我就呆在家里。 3．if引导词用法 if引导的条件句有：真实条件句和非真实条件句两种。 真实条件句：表示在某种条件下某事很可能发生。 you ask him, he will help you. 如果你请他帮忙，他会帮你的。 4．unless引导词用法 固定搭配：unless=if...not 除非，若不，如果不 will fail to arrive there in time unless you start earlier. =If you don’t start earlier, you will fail to arrive there in time. 如果你不早点动身，你就不能及时赶到 那儿。 注意：在含有条件状语从句的复合句中，当主句是一 般将来时态，从句要用一般现在时（即主将从现原 则）。如果主句是祈使句或含有情态动词时，从句也 用一般现在时表将来。
you study hard, you will pass the exam. 1. I will send you an e-mail as soon as I ____ A___ in Canada. A. arrive B. arrived C. am arrivi ng D. will arrive 2. If there ____A___ no buying and selling of an imals, there ______ no killing in nature. A. is; will be B. will be; will be C. is; is D. will be; is 3. I’m waiting for my , I'll go shopping alone. A. If she comes B. If she won't come C. If she doesn't come 5. You can’t watch TV ___A_____ you finish your homework. A. unless B. if C. while D. as students _____A___ have a sports meeting this we
高中英语冠词练习题及解析
高中英语冠词练习题及解析 一、单项选择冠词 1．Titan is believed to be the only body in _____ solar system other than the Earth with liquid on ______ surface. A．the; / B．/; the C．/; / D．the; the 【答案】D 【解析】 太阳系是独一无二的事物,为特指,某物表面也是特指,所以都需要加定冠词,故选D. 2．They haven’t made ________con tact with each other since they had ________quarrel two weeks ago. A．the; the B．不填; a C．a; the D．不填; the 【答案】B 【解析】 考查冠词的用法。句意“他们自从两周前吵架后就没再联系过。”make contact with sb.“和某人有联系”；have a quarrel with sb.“和某人吵架”。故选B。 3．When you finish reading the book, you will have __ better understanding of __ life. A．a, the B．the, a C．/, the D．a, / 【答案】D 【解析】 试题分析：考查冠词。本题第一空是固定词组have a better understanding of有更好的理解；第二空的名词Life是一个抽象名词，要单独使用，不需要冠词。句意：当你读完这本书的时候，你会对生活有更深的理解。故D正确。 考点：考查冠词 点评：冠词的考查集中在the表示特指；a/an表示泛指。另外要注意冠词的一些固定搭配中冠词的使用。这题主要是抽象名词具体化的用法，除了honor还有success，failure，surprise，pleasure等名词也可以表示抽象名词具体化。 4．As ________ matter of fact, ________number of young couples who plan to have a second kid is increasing rapidly. A．the; a B．a; the C．a; a D．不填；the 【答案】B 【解析】 试题分析：考查冠词。第一空，固定搭配：as a matter of fact,实际上，事实上；第二空，根据谓语动词是is单数可知填the，the number of…的数量。故B正确 考点：考查冠词 5．________ middle school that Lucy is going to attend is ________ public school.
高中英语语法(全英详细讲解)
必修一 语法点一：Be+v.ing表将来 use the present continuous tense for future plans In English, we have lots of ways of talking about the future. The most common ways of talking about the future we encounter use ‘will’ or ‘be going to’ followed by an infinitive（动词原形）, and we tend to use ‘be going to’ most often for talking about future plans. Sometimes, we also use the present continuous tense to talk about future plans. Ex. ①we are going to Mexico next Sunday. ② Are you coming to the cinema? ③ He is leaving for London in two hours. ④ We are spending next winter in Australia. Only some verbs can be used in this situation, such as: go, arrive, come, leave, start, stay, return, play, have, work, wear, spend, see, meet, etc. 扩展： What’s the difference between using ‘be going to’ and the present continuous to talk about future plans? Let’s look at some more examples: “I’m going to play football on Saturday” You have made a plan in your head but possibly not taken any real action to confirm it. Also, playing football on Saturday is probably not a regular event for you. “I’m playing football on Saturday” You have made a plan and taken some real action to confirm it (e.g. called your friends or booked a place to play). In this case, it’s likely that playing football on Saturdays is a common activity for you. 语法点二：Direct speech and indirect speech(直接引语和间接引语) Let's first define the terms, then look at how to talk about what someone said, and how to convert speech from direct to indirect or vice-versa. You can answer the question What did he say? in two ways: by repeating the words spoken (direct speech) by reporting the words spoken (indirect or reported speech). Direct speech repeats, or quotes, the exact words spoken. When we use direct speech in writing, we place the words spoken between quotation marks (" ") and there is no change in these words. Reported or indirect speech is usually used to talk about the past, so we normally change the tense of the words spoken. We use reporting verbs like 'say', 'tell', 'ask', and we may use the word 'that' to introduce the reported words. Quotation marks are not used. 1、declarative sentence陈述句 ①Change in pronoun:The pronoun (subject) of the reported speech is changed according to the pronoun of reporting verb or object (person) of reporting verb (first part of sentence). Sometimes the pronoun may not change. In following example the pronoun of reported speech is “I” which will be changed
条件状语从句讲解
条件状语从句 条件状语从句是一种比较常见的状语从句，引导条件状语从句最常用的连词是 if, 由if引导的条件状语从句表示在某种条件下某事很可能发生。如： If you ask him, he will help you. 如果你请他帮忙, 他会帮你的。 If you fail in the exam, you will let him down. 另外, if从句还表示不可实现的条件或根本不可能存有的条件, 也就是一种虚 拟的条件或假设, 从句多用一般过去时或过去完成时。如： If I were you, I would invite him to the party. I would have arrived much earlier if I had not been caught in the traffic. 如果没有堵车, 我会到的早一点儿。 其他的连词： 1.unless conj. 除非, 若不, 除非在…的时候 You will fail to arrive there in time unless you start earlier. 如果你不早点动身, 你就不能即时赶到那儿。 Unless it rains, the game will be played. 除非下雨, 比赛将照常实行。 2. on condition (that)...在……条件下, 如果; on condition (that)...引 导的条件从句是主句事件发生的前提条件或唯一条件。 I can tell you the truth on condition that you promise to keep a secret. 我能够告诉你真相, 条件是你答应保守秘密。 You can go swimming on condition (that) you don’t go too far from the river bank. 你只有在不远离河岸的条件下才能够下水游泳。 3. supposing conj. 如果, 假如 supposing引导的条件从句表示一种假设条件 Supposing it rains, shall we continue the sports meeting?