1、定义用在系词之后，表明主语的年龄、身份、状态、特征等的句子成分。

2、特征：找准系词，后面的就是表语啦 系词分三类：1 各种be（is am are was were） 2 感官动词 feel look sound taste smell 3 表示变化和不变的词 get turn go become (变化) keep stay remain（不变）举例 this is (a good book) he feels (cold) his face (turned red) the food (went bad) the baby (stays healthy) 括号内为表语。