■五条用法：

根据“… of which / whom”引导的定语从句时介词of的不同用法，下面我们为同学们归纳五条用法：

1. of 表示整体与部分的关系

这里所说的整体与部分的关系，指的是of前面的不定代词或数词表示“部分”，of后面关系代词表示“整体”，如 five of which 的意思就是“……当中的五个”，a few of whom 的意思就是“……当中的几个”等。请看实例：

I bought a dozen eggs, six of which broke when I dropped the box.  我买了一打鸡蛋，六个在我失手掉了盒子时摔碎了。

The buses, most of which were already full, were surrounded by an angry crowd.  公共汽车大多数都已经挤满了人，它们被愤怒的人群包围着。

2. of 表示所属关系

这里所说的所属关系，其实就是一种所有格关系，如 the name of which 的意思就是“……的名字”，the hair of whom的意思就是“……的头发”等。请看实例：

It was an agreement the details of which could not be altered. 这是一项其细节不可更改的协定。

In 1980 he caught a serious illness the effects of which he still suffers from. 1980年他患了到现在对他仍有影响的重病。

3. of 表示同位关系

所谓同位关系，指的是介词of前面的不定代词或数词与of后面的关系代词为同位关系，指的是同样的人或事物。如：

Both teams made some wild guesses, none of which were right. 两个队都是瞎猜一通，没有猜对一个。

We’ve tested three hundred types of boot, none of which is completely waterproof. 我们已经测试过300种靴子，没有一种是完全防水的。

Each corner had a guard tower, each of which was exactly ten meters in height. 每个角落都有一座警戒塔，每座警戒塔正好10米高。

4. 表示范围

of表示范围时，意思是“在……当中”，通常可译为“其中”。如：

They interviewed 30 people of whom five were possibles. 他们对30人进行了面试，其中有五人符合候选条件。

I saw three camp beds, of which two were occupied. 我看见了3张折叠床，其中两张已有人占了。

这类用法其实可以与表示整体与部分关系的of互换，如上面两句也可写成：

They interviewed 30 people, five of whom were possibles.

I saw three camp beds, two of which were occupied.

5. of 构成固定搭配

有时of与其他词语构成固定搭配，做题时要注意分清这个of到底是与哪些词构成什么样的固定搭配。如：

He’s married to a singer of whom you may have heard. 他与一位歌唱家结了婚，你可能听说过这个人。（注意固定搭配hear of）

Never teach a child anything of which you are not yourself sure. 不要将你自己都没有把握的东西教给孩子。（注意固定搭配be sure of）

The cell is the unit of which all living organisms are composed. 细胞是构成一切生物的单位。（注意固定搭配be composed of）

We struck up a conversation, in the course of which it emerged that he was a sailing man. 我们聊了起来，在谈话过程中得知他是一名水手。（注意固定搭配in the course of）

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