这就是那个人，我们刚才谈论过他。

(4)在限制性定语从句中，指人时，作宾语的whom可以用who或that代替，但在非限制性定语从句中不可以代替。

He is the very person (whom/who/that) we referred to.

他正是我们提到的那个人。

4.as和which引导的非限制性定语从句的区别。

(1)as在非限制性定语从句中作主语、表语或宾语，这个定语从句说明整个句子。as既可以放在主句之后，也可以放在主句之前，还可放在主句之中，有"像......一样，正如，正像"的意思。

As we all know，he studies very hard.(as作宾语)

我们都知道他学习用功。

As is known to all，he is the best student in our class.(as作主语)

众所周知，他是我们班上最好的学生。

Taiwan，as is known to all，is an inseparable part of China.(as作主语)

大家都知道，台湾是中国不可分割的一部分。

(2)which引导的非限制性定语从句既可指代整句话的内容，也可指代某个词或词组，但是不能放于句首。

He was late for the meeting，which made the chairman very angry.

他开会迟到了，主席为此非常生气。

I want to buy the house，which has a garden.

我想买这座房子，它带有一个花园。

即时跟踪1　用适当的关系词填空

(1)Li Lei's father，who was an engineer before his death，died when Li Lei was very young.

(2)Sydney，which is the largest city in Australia，is not its capital city.

(3)Confucius，whose influence on Chinese people has been the greatest，was born in 551 BC.

(4)She has two sons，the older of whom has just graduated from college.

(5)As is often the case with him，he was fined for speeding.

(6)At last he came back to the small village，where he was born and brought up.

二、定语从句中的省略

定语从句可以省略或简化，主要通过以下形式：

1.省略作宾语的关系代词

在定语从句中作宾语的关系代词有who(m)，which，that。在限制性定语从句中，当who(m