怎样区别主语从句,宾语从句,表语从句,同位语从句?答:表语从句就是用一个句子作为表语。The problem is puzzling.主语 连系动词 形容词作表语The problem is when we can get a pay rise.主语 连系动词 一个句子作表语---表语从句连接表语从句的连接词有:that, what, who, when, where, which, why, whether,how.He has become a teacher.He has become ...