系表结构有两部分构成：连系动词和表语 一 连系动词： 连系动词分为三类：be 动词，感官动词，趋势动词。

1) Be 动词：am, is, are, was, were 2) 感官动词：sound, look, taste, feel, smell 3) 趋势动词：appear, become, grow, get, turn, seem, remain 注意： 有一些动词既可以做连系动词又可以作及物动词和不及物动词。

He is growing very fast. ---不及物动词 I am growing apples in my backyard.---及物动词 The sea is growing rough.---连系动词 He is tasting the food.--- 及物动词 The food tastes good.--- 连系动词 二 表语： 下列成分都可以做表语：名词， 形容词，副词， 动词不定式，动名词，现在分词，过去分词，表语从句． 使用举例(注意：连系动词不能够单独作谓语，他们必须和表语一起工作构成谓语): 1) 名词: False： I am. Right： I am a student. 2) 形容词： False： He became. Right： He became strong. 3) 副词： False： She remained. Right： She remained there. 4) 现在分词： False： The story seemed. Right: The story seemed interesting. 5) 过去分词： False： The windows seemed. Right: The windows seemed broken. 6) 动名词： False： His job is teach English. Right: His job is teaching English. 7) 动词不定式： False： Her plan is become the winner in the game. Right: Her plan is to become the winner in the game. 6）和7）的区别： 6）中动名词表示某人经常干某事：她从星期一到星期五天天教英语； 7）中动词不定式表示某人将要干某事：她的计划是将要成为比赛的胜者。

8) 表语从句： False：The question is. Right: The question is whether he will come here in time tomorrow. Right: The question is what he is going to do next. Right: The question is how he has managed to solve the problem by himself.。