1、It的用法"It" 用法及其句型和固定搭配，是高中英語(yǔ)語(yǔ)法的重點(diǎn)、難點(diǎn)，又是近幾年高考的熱點(diǎn)，因此應(yīng)給予充分的重視，現(xiàn)將it用法歸納如下：一、It用作實(shí)詞表達(dá)以下概念:指代前文提到的事物，如前文中的this, that；替代前文中的內(nèi)容；指代一位性別不明的小孩或未知的人；指代未指明但談話(huà)雙方都知道的那件事；指代時(shí)間、天氣、氣候、距離等自然現(xiàn)象 二、It用作形式主語(yǔ)替代作主語(yǔ)的從句、動(dòng)詞不定式、動(dòng)名詞，而把真正作主語(yǔ)的從句、動(dòng)詞不定式、動(dòng)名詞置于句尾。 It 作形式主語(yǔ)的常見(jiàn)句型： 1. 代作主語(yǔ)的動(dòng)詞不定式，其句型為: (1) It be adj. (for sb

2、.) to do sth. 此處adj. 通常為描述事件的形容詞：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 

3、; 例:  It is illegal (for a teenager) to drive a car without a license. (2) It be adj. of sb. to do sth. 此處adj. 通常為描述人的形容詞：kind, unkind, nice, rude, cruel, considerate, thoughtful, thoughtless, careful, careless, silly, foolish, stupid, clever, wise, crazy. 例:  It's kind of you to

4、help me with the problem.  (3) It替代作主語(yǔ)的動(dòng)名詞的常見(jiàn)句型: It's no good/use doing                It's (well)worth doing   It's (well)worth one's while doing/to do It's (well)worth while doing/ to

5、 do       例:  It's no use crying over spilt milk（覆水難收）. 2. It替代作主語(yǔ)的從句常見(jiàn)句型 ：(1) It is + noun +從句 例:  It is no secret that the president wants to have a second term at office.  (2) It is adj. +clause It's surprising that (should)竟然 It's a p

6、ity/shame that(should)竟然       例:  It's important that you should apologize to her for your rudeness.(=It's of much importance that you should apologize to her for your rudeness.) (3) It verb sb. + clause= It is v-ing + clause It+surprise/delight/inter

7、est/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 例:  It (so) happened/chanced that they were out.(= They happened/cha

8、nced 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.) 

9、 (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作主語(yǔ)的句型1. It takes sb. to do(=sb takesto do)某人用多長(zhǎng)時(shí)間做某事 例:  It took the men a week to mend our roof.(=

10、The men took a week to mend our roof.) 2. It's (just)(un)like sb. to do（不）像某人做某事的風(fēng)格 例:  It was (just) like him to think of helping us. 3. It's (about/high) time that should /v-ed是該做某事的時(shí)候了 例:  It's(about/high) time that we should take action. 4. It's the x-th time (that) hav

11、e v-ed第幾次做某事了 例:  It's the third time that he has failed the driving test. 5. It is/has been since continuous v-ed(延續(xù)性動(dòng)詞) 某動(dòng)作持續(xù)了多長(zhǎng)時(shí)間 例:  It's 10 years since he lived here6. It was(not) before過(guò)(不)了多長(zhǎng)時(shí)間某動(dòng)作發(fā)生了 例:  It was not long before they arrived. 四、It 作形式賓語(yǔ)用來(lái)替代作賓語(yǔ)的從句、動(dòng)詞不定式、動(dòng)名

12、詞，而把真正作賓語(yǔ)的從句、動(dòng)詞不定式、動(dòng)名詞置于句尾。 It 作形式賓語(yǔ)的常見(jiàn)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 you'll do the task on your own. 2. verb+it+adj./noun (one'

13、;s) doing (adj.=useless/worth/worthwhile)(noun=no use/no good/worth one's while/a waste of time/money/energy/words) (verb=think, believe,suppose, consider, feel, make, keep) 例:  I'll make it worth your while telling me about his secret. 3. verb+it+ important/unimportant/necessary/unnece

14、ssary/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) attend the conference. 4. verb + it+ as+ noun/adj.+ clause (verb=accept, regard, take, see, view) 例

15、:  The lecturer takes it as encouraging when so many students attend his lecture. 5. v. +it + prep. + that owe it to sb. that把歸功于 leave it to sb that把留給某人去做 take it for granted that 想當(dāng)然 keep it in mind that 例:  Don't bother to arrange anything. Just leave it to me to sort out. 6. It用在不能直接跟賓語(yǔ)從句的動(dòng)詞后面，尤其是表示好惡的動(dòng)詞后，enjoy, like, love, dislike,