限制性定语从句:
限制性定语从句对先行词起限制、修饰的作用,关系代词有that,which,whom,who,whose以及关系副词when,where等,没有明显的逗号把从句与主语分开,表达的意思为被修饰词的一个定语。
例句:
Do you know the professor who is speaking at the meeting?
Where is the book which I bought this morning?
非限制性定语从句:
作用相当于一种插入语或者对先行词的一种解释,和先行词之间只有比较松散的关系,文字中常常用逗号将其与主句分开,用法其实与限制性定语从句极为相似,只是不能用that做修饰词。
例句:
This letter is from his parents, who are working in Tibet.
Englishi is an important subject, which every students should study well.
The building, in front of which sat a boy, was a school.
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