表语是用来说明主语的特征、状态等,补充说明主语的意义,因此,它也叫作主语补语。表语一般用在连系动词后面,连系动词除了be之外,还有become(成为)、look(看起来)、turn(变成)、go(变成)、seem(似乎)、appear(似乎、显得)、feel(摸起来)、sound(听起来)、smell(闻起来)等等。可做表语的有: 形容词、代词、名词、分词、动名词、数词、介词短语或副词和从句:例如: We are students. He is very clever. 表语从句:表语从句在句中作表语,位于主句中的系动词之后,如: The question is who can complete the difficult task . 问题是谁能完成这项艰巨的任务。表语从句还可用 as if引导。He looked as if he was going to impress everything in the room into his mind. 他看上去是要把屋里的一切都印入脑海分析表语从句的文章: http://gaokao.ewstudy.com/xtfx/2007/08/2007-08-295056.html 你自己看吧