表语指系动词来自和它后面的名词、形容词或者介词短语构成的句子部分。she is a nurse.(is+ 名词)They look very nice. (系动词look + 形容词)The books are on the bookshelf. (系动词be+ 介词短语)常见的系动词除了be,还有特殊用法中的look,remain,ge效究流皮花免入太t,become,grow等等。