用户中心
华慧考博:英语语法中It的用法总结
It的用法，是英语语法的重点、难点。It 有时候可以作为实词出现,用于指代人以外的第三者,但更多的时候It是用来作形式主语的代词来用的.在英语中It有多少种用法呢?华慧考博老师现将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。
1. 替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等。
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等。
例：It’s kind of you to help me with the problem.
2. it替代作主语的从句常见句型：
(1) It is + n. +从句
例：It is no secret that the president wants to have a second term at office.
(2) It is+ adj. +从句
It’s surprising that... (should) ...竟然……
It’s a pity/shame that... (should) ...很遗憾/惭愧……
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.
你要为你粗鲁的行为向她道歉，这很重要。
(3) 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.
据说，这对夫妻离婚了。
(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.
我们建议，他们以第三个问题开始！
（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 man a week to mend our roof.= The man took a week to mend our roof.
这个男人花了一周时间修补我们的房顶。
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.
想到帮助我们像他的做事风格。
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. 我们是时候采取行动了。
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. 这是他第三次驾照考试失败。
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：It's ten years since he lived here. 他已经有10年不住在这里了。
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. 过不了多久他们就会到了。
（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.
更多考博经验以及考博真题请大家关注华慧考博：www.hhkaobo.com 全国专业考博英语辅导机构。及时为大家更新全国各大院校博士招生简章，收集完善各院校考博英语真题、考博专业课真题等重要考博讯息。专业考博英语辅导团队精心为您打造考博英语复习计划，助力广大考生顺利登岸！
扫描二维码关注华慧考博官方微信公众号
发送消息"6"即可免费领取超值考博资料
