英语中什么是状语,表语,补语...,以及状语从句,表语从句,宾语从句...答:主语从句一般放在句首。引导主语从句的词有下列:that, who, whether, if, what, which, when, where, how, why.Who cleaned the blackboard is not known yet.谁擦的黑板还不知道。What he said is not true.他说的不是实话.That he'll come to see us is really great.他来看我们真是太...