[10-20 18:09:40] 来源：http://www.67xuexi.com 初一英语 阅读：85494次
一、以形式主语it引导的句型。
句型1. It happened（chanced） that +clause. = sb. happened /chanced 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/ had done 如：（还有动词appear可这样使用）
It seemed that he had been to Beijing before.好象你以去过北京。=He seemed to have been 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谓语动词否定的转移，及形式）。
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。（注意从句中的谓语动词用的是虚拟语气）
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 have missed 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）
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+for+ sb.+ to do. 如：
It is impossible for me to finish this work before tomorrow.我明天之前完成此工作是不可能的。
句型15、It is +（心理品质方面的）形容词+of + sb. + to do. = 主语+ be +形容词+to do.（常用的形容词有：kind, stupid; foolish, good, wise等。）如：
It is kind of you to help me.=You are kind to help me.你真好给我提供了帮助。
二、定语从句：
句型16、由as引导的非限定性的定语从句。如：
As we have known, he is a most good student.众所周知，他是个很好的学生。请比较：It is well-known that he is a most good student.（前一个是定语从句，而后者是个主语从句。）
句型17、由which引导的非限定性的定语从句。如：
He is a professor, which I have been looking forward to becoming.
他是个教授，那是我一直盼望的职业。（因为先行词professor是表示职业的名词，因此引导词用which，而不用who。（注意：关于which和as之间的比较请看语法的定语从句部分。）
句型18、由where, when引导的定语从句（其中包括限定性的或非限定性的。）如：
This is the house where I used to come.请比较：This is the house which / that I used to come to.
This is the day when I joined the Party.请比较：This is the day which / that I joined the Party on.
说明：关于that与which之间的区别，请看语法中的定语从句。
三、让步状语从句
句型19、No matter what / which / who / where / when /
whose+从句，+主句。注意从句中的时态一般情况用一般现在时态。如：
No matter what you do, you must do it well.请比较：Whatever you do, you must do it well. 无论你做什么，一定要做好。