英语语法it的句型
英语最早被中世纪的英国使用，并因其广阔的殖民地而成为世界使用面积最广的语言。下面是小编为大家整理的关系副词引导的定语从句详解，欢迎阅读与收藏。以下是小编整理的英语语法it的句型，希望对大家有所帮助。
It 作形式主语的常见句型：
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, 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.
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. +clauseIt'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 + 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.
英语语法知识
倒装：全部倒装和部分倒装
谓语部分所有单词都放在主语前是全部倒装。谓语的一部分放在主语的.前面是部分倒装。
谓语中的一部分通常是指：1、系动词;2、助动词;3、情态动词。
全部倒装的五条原则：
1. There be句型;
2. 以There或now开头的句子，且句子谓语动词为come或go;
3. 以Here开头的句子，且句子谓语动词为系动词be; Here you are. 拿去。
4. 以副词out， in， up， down， away开头的句子;
5. 以状语开头的句子。
倒装：六条原则
1. so放在句首时表示承前肯定，这个句子用部分倒装;
nor， neither放在句首时表示承前否定，句子也用部分倒装;
2. 省略了引导词if 的虚拟条件从句，可以把从句中的had， should， could， were中的任何一个提到从句最前面的位置，构成部分倒装;
3. as， though表示 尽管 时引导从句，从句中的表语可以置于引导词之前构成部分倒装;
系动词后面的部分就是表语，形容词、名词、名词性短语可以置于系动词之后。
关于英语语法
强调句结构
常用的强调句结构是it 引导的句子，结构为It is(was)+ 被强调部分+ that (who) + 句子的其余部分。此结构强调的成分限于主语，宾语和状语。例如：
It is from the sun that we get light and heat. 我们是从太阳那儿获取光和热。
It was not until I had read your letter that I understood the true state of affairs. 知道读了你的信，我才知道实际情形。
典型例题
1)It was last night ___ I see the comet.
A. the time B. when C. that D. which
答案C. 强调句的结构是： It +be +强调部分 + that (who))+ 主谓句。 强调句的连词只有两个，that和who。当强调的部分是人，且为句子的主语时，才用 who，其余用that。再如：原句：My father did the experiment in the lab yesterday evening.
强调主语： It was my father who did the experiment in the lab yesterday evening.
强调宾语： It was the experiment that my father did in the lab yesterday evening.
强调时间： It was yesterday evening that my father did the experiment in the lab. (注意不用when)
强调地点： It was in the lab that my father did the experiment yesterday evening.
2)It is ten years ___ Miss Green returned to Canada.
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