This is the question weve had so much discussion about.

　　定语从句一般是修饰名词或代词的, 但间或也可以修饰整个句子a), 或是句子的一部分 b), 引导词用which:

　　They have invited me to visit their country, which is very kind of them.

　　The activity was postponed, which was exactly what we wanted

　　When deeply absorbed in work, which he often was, he would forget all about eating and sleeping.

　　She was very patient towards the children, which her husband seldom was.

　　whose: 在表示...的这个概念时, 可用所有格 whose; whose 用于指物, 有时可与of which交替使用, 通常的词序是名词词组 + of which:

　　Is there anyone in your class whose family is in the northeast?

　　We had a meeting whose purpose was completely unclear.

　　Hes written a book the name of which Ive completely forgotten.

　　of which前的名词词组也可以由some, any, none, all, both, several, enough, many, most, few以及基数词担任; 这些词也能用在 of whom之前.

　　The buses, most of which were already full, were surrounded by an angry crowd.

　　Its a family of eight children, all of whom are studying music.

　　关系副词 when, where, why: 它们的含义相当于 at which, in which, for which, 因此它们之间有交替使用的可能.

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