介詞的選擇是根據從句的動詞決定的，不及物動詞後要跟介詞
①of which相當於定語whose，後加名詞，相當於是一個形容詞。
eg：There are many books in the shelf， of which/whose covers are old.
書架上有許多封面陳舊的書。
②，in which相當於疑問詞where，是對地點名詞的修飾。
如：The book （in which/where there are many stories） in his.
這本有許多故事的書是他的
③on which相當於特殊疑問詞when，是對時間的修飾。
如：I will never forget the best time when/on which we enjoyed ourselves.
④，for which相當於疑問詞why，是對原因的修飾。
如：I don't the reason why/for which he was late.
我不知道他遲到的原因
⑤at which相當於疑問詞how，是對方式名詞的修飾
介詞➕which/whom引導的定語從句+長難句打卡Day1
“介詞+關係代詞”引導的定語從句，是定語從句一種介詞前置的定語從句句型，介詞與關係代詞之間存在一種介賓關係。當關系代詞在定語從句中作介詞賓語時，把介詞置於關係代詞前，即演變出“介詞+關係代詞”句型。
例如：
The man who/whom /that you spoke to is a teacher.
=The man to whom you spoke is a teacher.
一、基本構成
1、“介詞+關係代詞”結構引導的定語從句中，關係代詞只能用which（指物）或whom(指人) ，即：介詞+which/whom。
（1）The man to whom you spoke is a teacher.
（2）The city in which she lives is far away.
（3）The little girl is reading a book， in which there are many cartoons.
注意：當介詞放在關係代詞的前面時，用在介詞後的關係代詞不能省略。
2、在限制性定語從句中，當介詞置於定語從句的謂語動詞之後時，可用that/which(指物)that/who/whom（指人）作介詞的賓語.且此處關係代詞可以省略，特別是在口語中。如：
（1) The man (who/whom /that )you spoke to is a teacher.
（2）The city（which/that）she lives in is far away.
注：通常介詞放在定語從句中動詞後，也可以放在關係代詞前面，但有些特殊動詞短語搭配不能拆分，介詞只能放在動詞後，如： look for， look after， pay attention to ，take care of ， look forward to， listen to等。
This is the pen that / which you are looking for.
The patient whom she is looking after is her father.
The words that /which we should pay attention to are written on the blackboard.
There are fifty patients who/whom/that we must take good care of.
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