英语的主句和从句怎么区分啊

问题描述:

英语的主句和从句怎么区分啊
我不需要区分宾语从句、时间状语从句、定语从句等等
我只是想知道怎么区分主句和从句
例如:
We are sure that he didn't see the movie last night.
Bill's aim is to inform the viewers that cigarette advertising on TV is illegal
这些句子哪个是主句哪个是从句?

从句前面必须有关联词来引导 关联词有:what that if because as ...,相反,如果一句话,比如:I like English that is interesting.主语 I 前面没有任何的关联词 所以 I like English 就是主句 剩下的就是从句