要根据这个从句所在的位置和它和主句之间的关系来判断一个从句是什么从句.一.如宾语从句就在及物动词后或是在介词后.eg:I doubt whether he will come this afternoon.(从位置上看这是一个宾语从句)eg:They are talking about whether they will have a picnic this weekend.(从位置上看这也是一个宾语从句)二.主语从句在动词之前,或是在有形式主语时的句子后面.eg:That he was late again made his teacher angry.(that引导的是主语从句)eg:It is certain that he will win the game.(that引导的也是主语从句)三,表语从句要在系动词之后eg:This is what I want.(what引导的是表语从句)四.同位语从句在名词或代词之后,对这个词进行解释说明.eg:The news that we will have a exam is true.(that引导的是同位语从句)五.定语从句也在一名词或代词之后,但是是对这一词的修饰限定.eg :The news that he told us is true.(这是一个定语从句,因为先行词在从句中作了宾语)六.状语从句有很多种,有的在主句之前,有的在主句之后,要看情况.总之是强调谓语动词发生的时间,地点.原因.条件,方式等.eg:When I am free this afternoon, I will go to see you.(when引导的时间状语从句) I found the book where I lost it.(where引导的是地点状语从句) Although he was ill, Tom went on working.(although引导的是让步状语从句)
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