It”用法及其句型和固定搭配讲解

精品文档，仅供学习与交流，如有侵权请联系网站删除“It”用法及其句型和固定搭配讲解It 用法及其句型和固定搭配，是高中英语语法的重点、难点，又是近几年高考的热点，因此应给予充分的重视，现将it用法归纳如下：一、It用作实词表达以下概念:指代前文提到的事物，前文中的this, that;替代前文中的内容;指代一位性别不明的小孩或未知的人;指代未指明但谈话双方都知道的那件事;指代时间、天气、气候、距离等自然现象二、It用作形式主语替代作主语的从句、动词不定式、动名词，而把真正作主语的从句、动词不定式、动名词置于句尾。It 作形式主语的常见句型：1. 代作主语的动词不定式，其句型为(1) It be adj. (for sb.) to do sth.此处adj. 通常为描述事件的形容词：easy, difficult, hard, necessary, unnecessary, possible, impossible, likely, unlikely, right, wrong, important, unimportant, legal, illegal, well-mannered, ill-mannered, polite, impolite, clear, obvious, certain, suitable, proper, fit, useful, useless, dangerous例 It is illegal (for a teenager) to drive a car without a license.(2) It be adj. of sb. to do sth.此处adj. 通常为描述人的形容词：kind, unkind, nice, rude, cruel, considerate, thoughtful, thoughtless, careful, careless, silly, foolish, stupid, clever, wise, crazy.例 Its kind of you to help me with the problem.(3) It替代作主语的动名词的常见句型Its no good/use doingIts (well)worth doingIts (well)worth ones while doing/to doIts (well)worth while doing/ to do例 Its no use crying over spilt milk.2. It替代作主语的从句常见句型(1) It is + noun +从句例 It is no secret that the president wants to have a second term at office.(2) It is adj. +clauseIts surprising that (should)竟然Its a pity/shame that(should)竟然例 Its important that you should apologize to her for your rudeness.(=Its of much importance that you should apologize to her for your rudeness.)(3) It verb sb. + clause= It is v-ing + clauseIt+surprise/delight/interest/disappoint/worry/disturb/annoy/amaze/bother/concern/frighten/please/anger sb. that例 It worried me that she drove so fast.(= It was worrying that she drove so fast.)(4) It verb (to sb.) that= sb/sth verb to do(verb = appear, seem, come about, emerge, follow, chance, happen, occur, transpire, turn out , work out)例 It (so) happened/chanced that they were out.(= They happened/chanced to be out.)(5) It is v-ed that=sb/sth is to do(verb=say, report, think, believe, hope, expect, agree, accept, decide, determine, intend, plan, understand, know)例 It is said that the couple have gotten divorced.(=The couple are said to have gotten divorced.)(6) It is v-ed that (should)(verb=demand, request, require, order, suggest, advise, recommend例 It is suggested that they should begin with the third question.三、It作主语的句型1. It takes sb. to do(=sb takesto do)某人用多长时间做某事例 It took the men a week to mend our roof.(= The men took a week to mend our roof.)2. Its (just)(un)like sb. to do(不)像某人做某事的风格例 It was (just) like him to think of helping us.3. Its (about/high) time that should /v-ed是该做某事的时候了例 Its(about/high) time that we should take action.4. Its the x-th time (that) have v-ed第几次做某事了例 Its the third time that he has failed the driving test.5. It is/has been since continuous v-ed(延续性动词) 某动作已有多长时间不发生了例 Its 10 years that he lived here6. It was(not) before过(不)了多长时间某动作发生了例 It was not long before they arrived.四、It 作形式宾语用来替代作宾语的从句、动词不定式、动名词，而把真正作宾语的从句、动词不定式、动名词置于句尾。It 作形式宾语的常见句型：1. verb+ it+ adj./noun (for/of) to do/clause (verb=think, believe, suppose, consider, feel, make, keep)例 I think it hard for you to do the task on your own./I think it hard that youll do the task on your own.2. verb+it+adj./noun (ones) doing (adj.=useless/worth/worthwhile)(noun=no use/no good/worth ones while/a waste of time/money/energy/words) (verb=think, believe, suppose, consider, feel, make, keep)例 Ill make it worth your while telling me about his secret.3. verb+it+ important/unimportant/necessary/unnecessary/natural/essential that (should)verb+it+of much/great/no/little importance that(should)(verb=think, believe, suppose, consider, feel, make, keep)例 I think it important that you (should) attendthe conference.4. verb + it+ as+ noun/adj.+ clause (verb=accept, regard, take, see, view)例 The lecturer takes it as encouraging when so many students attend his lecture.5. v. +it + prep. + thatowe it to sb. that把归功于leave it to sb that把留给某人去做take it for granted that 想当然keep it in mind that例 Dont bother to arrange anything. Just leave it to me to sort out.6. It用在不能直接跟宾语从句的动词后面，尤其是表示好恶的动词后，enjoy, like, love, dislike, resent, hate, dont mind, be fond of, feel like, see to 宾语从句紧跟it之后例 I hate it you can swim so well and I cant.7. It用在不能直接跟宾语从句的介词后面，宾语从句紧跟it之后(except that例外)例 Im for it that you will follow their advice.五、强调句型It is/was+被强调部分+ that(who) 强调句型用来强调谓语动词以外的任何句子成分。当被强调部分是人时也可以用who。在使用强调句型时需注意以下几点：1. 请注意强调句型的特殊疑问句例 When was it that he changed his mind to take part in the activity?2. 在强调原因状语从句时，只能强调由because所引导的从句例 It was because he was ill that he didnt come to school yesterday.3. 在强调not until结构时必须把not与until一起放到被强调的位置上例 It was not until she took off her dark glasses that I realized she was my brother.4. 注意强调句型与定语从句的区别例 It was at 7 oclock that he came here yesterday.( 强调句型)It was 7 oclock when he came here yesterday.(定语从句)六、It 常用的固定搭配1. make it(1).在口语当中相当于succeed,表示：成功、做到、说定、赶上、及时到达例 Its hard to make it to the top in show business.(2).在口语中相当于fix the date for,表示“约定好时间”例 Shall we meet next week?OK. We just make it next Saturday.2. as it is(1).相当于in fact, in reality表示“事实上，实际情况是”例 We had planed to finish the task today, but as it is we probably wont finish it until next week.(2).相当于方式状语从句，表示“照原样”例 Leave the table as it is.3. as it were 相当于as one might say, that is to say, 表示“也就是说，可以说，换句话说”例 He is, as it were, a modern Sherlock Holmes.4. if it werent for/if it hadnt been for用来引导虚拟语气，相当于without, or but for, 表示“如果不是，要不是”例 If it werent for Tom, I wouldnt be alive today.5. thats it(1). 相当于Thats all. Thats so much. 表示“至此为止，没有别的了”例 You can have one more sweet, and thats it.(2). 相当于 Thats right.表示“对啦”例 I guess the key to the problem is thechoice “A”Thats it.6. catch it 在口语中，相当于be punished/scolded for doing sth. wrong. 表示“因做错事而挨骂，受责备，受批评，受惩罚”例 Well really catch it form our teacher if were late for class again.7. have it(1).相当于say, insist表示“说，主张，表明，硬说”例 Rumour has it that they are getting divorced.(2).相当于get to know something,表示“了解，知道，获悉”例 I had it from John that she was going abroad.8. have what it takes在口语中，相当于be well qualified for, 表示“具有成功的条件”例 You can take it from me that your daughter has what it takes to be a star.9. so it seems / appears.10. Keep at it! (Dont give up!)相当于go on,表示“继续做，不放弃”例 My teacher asked me to keep at it.11. Go it! (Go on!) 拼命干, 莽撞12. Now you have done it! (You have done sth. wrong.)13. Now youll catch it! (Youll be punished.)14. As it happened, 在口语中，相当于its a pity that, 表示“真不凑巧，真遗憾”例 As it happened, they were out.15. As it turned out,在口语中，相当于it was found to be in the end, 表示“最后被证明是”例 As it turned out, his statement was false.16. Such as it is(they are) 在口语中，相当于although it may not be worth much, 表示“虽然没有多大价值”例 You can borrow my exam notebook, such as it is.17. Take it/things easy. 相当于Dont worry or dont hurry. 用来劝告别人，表示“不要慌，别担心，存住气”例 Take it easy! He will do it well.18. Take it from me.在口语中，相当于believe me what I say.表示“请相信我的话，我敢担保”例 You can take it from me that he will make it this time.19. For what it is worth在口语中，相当于although Im not sure its of value, 表示“不管其价值如何”例 Here is the article I promise you, for what its worth.20. Worth it 在口语中，相当于useful, 表示“有好处，值得做”例 Dont hesitate about it! Its worth it.21. Believe it or not.表示“信不信由你”例 Believe it or not, Tom is getting married to Mary next Sunday.22. Take it or leave it. v. 要么接受要么放弃例 That is my last offer. You can take it or leave it.23. It all depends/that all depends 在口语中，相当于it hasnt been decided yet, 表示“那得看情况，还没有定下来”例 Are you going to the countryside for holiday?It/That all depends.24. Its up to sb. 在口语中，相当于its decided by sb. 表示“由决定，由负责，取决于”例 Shall we go out for dinner?Its up to you.【精品文档】第 7 页