高中寒假英语核心语法必背经典句型！
摘要：高中英语语法可以说每个同学必须掌握的基本知识点，英语语法多而杂很多同学容易搞混，下面文都高考网小编为大家系统性地整理了高中英语语法必背句子，希望对大家寒假收心复习有帮助！
学习高中英语语法的特点，可以说如果你没有彻底地把英语语法体系搞懂，那么你对语法永远是一知半解，反之，如果你真正把握了语法，形成了自己的英语语法体系，因为语法知识是固定的，只要英语语法考试也都逃不开那些体系，所以就会“easy”很多。
下面文都高考网小编为大家介绍高中寒假英语核心语法必背经典句型！希望对大家的复习有帮助。
一、以形式主语it引导的句型。 句型1.
It (so) happened(chanced) that +clause.
= sb. happened /chanced to do sth. =sb.did sth. by chance. 如：
It happened that he was out when I got there. 当我到那儿时，碰巧他不在。 =He happened to be out when I got there. = It chanced that he was out when I got there = He was out by chance when I got there. 句型2.
It seems that sb. do/ be doing/ have done/ had done= Sb. seems to do/ be doing/have done/to be done/to have been done(还有动词appear等可这样使用)如:
It seemed that he had been to Beijing before.他好像以前去过北京。 =He seemed to have been to Beijing before. 句型3.
It is / was+被强调的部分+that(who)+剩余的部分.如：
It wasn't until he came back that I went to bed.直到他回来我才睡觉。(一定要注意被强调句型中的谓语动词否定的转移)。It was because
he was ill that he didn't come to school today.只因为他有病了今天没有来上学。(只能用because而不能用for, as 或since)
It is I who am a student. 我确实是个学生。(句中am不能用are来代替。) 句型4.
It is high time (time/ about time)+ (that) 主语+should do / did+其它。(从句中的谓语动词用的是虚拟语气。)如:
It is high time that we should go / went home.我们该回家了。 句型5.
It is / was said ( reported…)+that+从句. 如：
It was said that he had read this novel.据说他读过这篇小说。 =He was said to have read this novel. 句型6.
It is impossible / necessary/ strange…that clause.(从句中的谓语用should+do/ should have done，其形式是虚拟语气。)如：
It is strange that he should have failed in this exam.真奇怪，他这次考试没有及格。 句型7.
It is + a pity/ a shame…that clause.(注意从句中的谓语动词用should do或should have done的形式，但should可以省略。)如：
He didn't come back until the film ended. It was a pity that he should
havemissed this film. 他直到电影结束才回来。他没有看到这部电影真可惜。 句型8.
It is suggested / ordered/ commanded /…that +clause.(从句的谓语动词用should do, 但should可以省略。)如：
It is suggested that the meeting should be put off.有人建议推迟会议。
句型9.
It is/was+表示地点的名词+where+从句。(注意本句不是强调句型，而是以where引导的定语从句。)如：
It was this house where I was born.请比较：It was in this house that I was born.(后一句是强调句型。) 句型10.
It is / was +表示时间的名词+when+从句。(注意本句型也不是强调句型，而是以when引导的定语从句。)如：
It was 1999 when he came back from the United States. 请比较：It was in 1999 that he came back from the United States. 句型11.
It is well-known that+从句。如：
It is well-known that she is a learned woman.众所周知，她是个知识渊博的妇女。 句型12.
It is +段时间+since+主语+did. 请比较： It was +段时间+since+主语+had done. 如：
It is five years since he left here.他已经离开这儿五年了。 It was five years since he left here.(同上)
注意下列句型的翻译:It is five years since he livedhere.他从这儿搬走已经有五年了。 句型13.
It +谓语+段时间+before+主语+谓语.(before引导的是时间状语从句。) 如： It wasn't long before the people in that country rose up.没有多久那个国家的人民就起义了。
It will be three hours before he comes back.三个小时之后他才能回来。 句型14.
It is +形容词(possible, impossible, necessary等) +for+sb.+ to do. 如：