1> 限定性与非限定性

1.1> hire a man

I want to hire a man who can speak English.
我想雇用一位会说英语的人。

• 限定；

I want to hire Curry, who can speak English.
我想雇用Curry， 他会说英语。

• 非限定；

1.2> two sons

He has two sons who work in that company.
他有两个在那家公司工作的儿子。

He has two sons, who work in that company.
他有两个儿子，他们都在那家公司工作。

1.3> a mobile phone

I bought a mobile phone, which can also work as a digital camera.
我买了一部手机，这部手机也可作位数码相机使用。

I bought a mobile phone which can also work as a digital camera.
我买了一部可作位数码相机使用的手机。

2> ，which组合

2.1> 指 “先行词”

She lent me some books，which were not so interesting.
他借了我一些书，那些书 不怎么有趣。

• 【，which】 指books；

2.2> 指 “前句的部分”

He said Curry had bought a diamond ring, which was ture.
他说Curry 买了一颗钻石戒指，这件事是真的。

2.3> 指 “前句的全部”

It rained all day yesterday, which I expected.
昨天下了一整天的雨，这是我所期待的。