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三、介詞的選用

介詞+關系代詞引導定語從句時，介詞往往受上下文的約束，究竟使用哪個介詞時得從下面幾方面來進行考慮。

(1) 從先行詞跟介詞的搭配習慣出發。如：

In front of my house, there is a tree, in which some birds are singing. 我的房子前有一棵樹，鳥兒正在樹上唱歌。(在樹上一般用介詞in)

(2) 從定語從句中的動詞、形容詞對介詞的習慣要求出發。如：(from www.52ysedu.com)

The computer for which I paid 5,000yuan is made in Shenzhen. 我花了五千元所買的這臺電腦使深圳造的。( pay 與for搭配)

(3) 從先行詞、定語從句中的動詞或形容詞兩方面同時考慮出發。如：

Do you know the girl with whom the man talked just now? 你認識跟那個男談話的女孩嗎？(talk 究竟接to, with還是接about, 這該由動詞及現行詞一起決定)

(4) 復合介詞+關系代詞。如：

Go down this road, at the end of which you can see a high building and it is our office building. 沿著條路走，在路的盡頭你會看到一座高大的建筑，那就是我們的辦公大樓。

(5) 名詞+介詞+ 關系代詞。如：

He has three children, one of whose children is studying abroad now. 他又三個小孩，其中一個在國外讀書。

注意：當定語從句的動詞與介詞是不可分割的固定搭配時，介詞不能放到關系代詞之前。如：

She has a little daughter, who is looked after by her grandma. 就不能寫成：She has a little daughter, after whom is looked by her grandma. 因為，look after 是不可分開的固定短語。

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