1. It (so) happened(chanced) that +clause. 碰巧…
= sb. happened /chanced to do sth. = sb. did sth. by chance.
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.
2. It seems/appears that sb. do/ be doing/ have done/ had done 似乎…, 好像…
= Sb. seems/appear to do/ be doing/ have done/to be done/to have been done
It seemed that he had been to Beijing before. 他好象以前去过北京。
= He seemed to have been to Beijing before.
3. It is / was+被强调的部分+that(who)+剩余的部分.
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)
4. It is/was+表示地点时间/的名词+where/when +从句。
(注意本句不是强调句型，而是以where/when引导的定语从句。)
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。)
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. (后一句是强调句型。)
5. It is / was said ( reported…)+that+从句. 据说/报道…
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.
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。)
It is strange that he should have failed in this exam. 真奇怪，他这次考试没及格。
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。)
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。
8. It is suggested / ordered/ commanded /…that +clause.
(从句的谓语动词用should do, 但should可以省略。)
It is suggested that the meeting should be put off. 有人建议推迟会议。
9. It is high time (time/ about time)+ (that) 主语+should do / did+其它。
是该做某事的时候了(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。
10. Not only +特定动词+主语+谓语…but also+主语+谓语… 不但…而且
Not only did he learned English well but also he spoke French very well.
