at which,in which,on which,for which,by which,from which的用法

简单点,不要例句!要准确

用在定语从句中等于什么!!!!

主要看从句中的不及物动词,比如for which.
我们可以造个句子方便理解:This is the book for which he is looking.即等于This is the book which he is looking for.这主要是因为look for 这一短语.

which在从句中做宾语,如上句,还原就是 he is looking for which.

其中in which≈where, 这里就不赘述了.

希望这样能对您有所帮助~呵呵

关系副词=介词+关系代词

 why=for which
 where=in which
 when=during which
 whose=of which

只知道这么多，希望对你有帮助。