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/
