英语句子基本句型有哪些

　　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beijing。=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.