7.介詞+關(guān)系代詞

　　★該結(jié)構(gòu)的關(guān)系代詞只有兩種即 介詞+which（指物） 介詞+whom（指人）

　　★該結(jié)構(gòu)介詞的選用原則：

　　(1)根據(jù)定語從句中謂語動詞的習(xí)慣搭配

　　This is the book on which I spent $ 8.

　　This is the book for which I paid $ 8.

　　(2)根據(jù)先行詞的搭配習(xí)慣

　　I remember the days during which I lived there.

　　I remember the day on which I graduated from university.

　　(3)根據(jù)整個句子所表達的意思來決定

　　The colorless gas without which we can’t live is called oxygen.

　　(4)英語中為了強調(diào)某一名詞，不定式前面也可以加上關(guān)系代詞

　　Here is the money with which to buy the piano.

　　She is the right person on whom to depend

　　注意：

　�、偃绻�介詞后移，關(guān)系代詞可以省略

　　The person (whom/who/that) you will write to is Todd.

　　②有些含有介詞的動詞短語介詞不能提前如look for/after; take care of; send for; hear from/of/about deal with等

　　This is the baby that you will look after.
 

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