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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. 當(dāng)我到那兒時，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（還有動詞appear等可這樣使用）如:
it seemed that he had been to beijing before.他好象以前去過北京。＝he seemed to have been to beijing before.
 
句型3.
it is / was＋被強調(diào)的部分＋that(who)+剩余的部分.如：
it wasn't until he came back that i went to bed.直到他回來我才睡覺。(一定要注意被強調(diào)句型中的謂語動詞否定的轉(zhuǎn)移)。 it was because he was ill that he didn't come to school today.只因為他有病了今天沒有來上學(xué)。（只能用because而不能用for, as 或since）
it is i who am a student. 我確實是個學(xué)生。（句中am不能用are來代替。）
 
句型4.
it is high time (time/ about time)+ (that) 主語＋should do / did+其它。（從句中的謂語動詞用的是虛擬語氣。）如:
 
it is high time that we should go / went home.我們該回家了。