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英语语法:高中英语It的用法

发布时间:2019-11-29 10:32:00源自:互联网作者:admin阅读()

【导语】"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,初中英语辅导网整理了“it的用法”,欢迎阅读参考!更多相关讯息请关注初中英语辅导网!

一、It用作实词

表达以下概念: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: It's 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:

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 do

例: It's no use crying over spilt milk(覆水难收).

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. +clause

It's surprising that… (should)………竟然……

It's a pity/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/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

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 porced.(=The couple are said to have gotten porced.)

(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 takes…to 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. It's (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. It's (about/high) time that… should /v-ed…是该做某事的时候了

例: It's(about/high) time that we should take action.

4. It's the x-th time (that) … have v-ed…第几次做某事了

例: It's the third time that he has failed the driving test.

5. It is/has been… since …continuous v-ed(延续性动词) 某动作持续了多长时间

例: It's 10 years since he lived here

6. 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 you'll do the task on your own.

2. verb+it+adj./noun (one'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/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) attend the 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. + that…

owe 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: Don't 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, don't 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 can't.

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: I'm for it that you will follow their advice.

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