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 beout when I got there.= It chanced that he was out when I got there= He was out by chancewhen I got there. 句型2.It seems that sb. do/ be doing/ have done/ had done= Sb. seems to do/ be doing/ havedone/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
