判断which前加什么介词
1、of which相当于定语whose,后加名词,相当于是一个形容词。
eg:There are many books in the shelf, of which/whose covers are old.
书架上有许多封面陈旧的书。

2、in which相当于疑问词where,是对地点名词的修饰。
eg:The book (in which/where there are many stories) in his.
这本有许多故事的书是他的。

3、on which相当于特殊疑问词when,是对时间的修饰。
eg:I will never forget the best time when/on which we enjoyed ourselves.

4、for which相当于疑问词why,是对原因的修饰。
eg:I don't the reason why/for which he was late.
我不知道他迟到的原因。

5、at which相当于疑问词how,是对方式名词的修饰。

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