who are you waiting for?是主谓宾但是his job is cleaning the office.却是主系表,

题目

who are you waiting for?是主谓宾但是his job is cleaning the office.却是主系表,
不要解释成主谓宾是什么主系表是什么.

答案

who are you waiting for?的一般现在时是“Who do you wait for?”这下楼主可明白为什么说它是主谓宾结构吧?
His job is cleaning the office 是一般现在时.这里的cleaning是动名词,与前面的is连在一起组成表语.