要想区分主句和从句,关键在于记住引起从句的关联词,关联词后的句子便是从句,另一个就是主句。关联词很多,有引导状语从句的:when, where, while, if, though, as if ; 引起定语从句的:which, that, who, whom, whose, as 等。引起宾语从句的:how, how many, how much, how old, how long, if, who, when, where 等。