4. Anyone ____ comes to China will surely visit the Great Wall near Beijing.

3. This magazine belongs to the teacher ____ teaches us history.

2. Most Americans love Chinese food, ____ is cooked in a different way from western food.

1. We are learning English, a language _____ is used in many places in

the world.

先比较下列句子中的what和that:

He told us the things that he had seen.　

-->　 He told us what he had seen.

This is the words which I said.　　　　

-->　 This is what I said.

　 可以看出what 实际上等于是 “the thing that(which)”, 即 “先行词+关系词”. 因此在句中如果已有先行词，则不能用what，而只能用that(which)，如没有先行词，则用what。what是 一个没有先行词的关系词。

定语从句练习　　　　

定语从句相当于形容词作定语， 对先行词加以限制或修饰，同位语从句相当于名词，对先行词加以补充或说明，连接词that在定语从句中充当某个成分，而that在同位语从句不充当句子成分.

The promise that my uncle gave me made us happy. (定语从句)

The promise that my uncle would give me a new bike made us happy. (同位语从句)

The news that they had won came.

　This is the same bag as I lost yesterday. (相似的事物)

　I am wearing the same coat that I wore yesterday. (同一事物)

4.　　　 The town is about the same distance from Nanjing as Yangzhou is.

　As 用于非限制性定语从句，常见以下句型：

as you know,　 as we have seen, 　as is known to all,　 as anybody can see,　 as was expected, 　　　 as we can imagine,　 as has been pointed out

　as与which的用法区别：as与 which在非限制性定语从句中，都可指代整个主句，但as引导的从句可放在主句的句首, 句中或句尾， 而 which引导的从句只可放在主句的句尾

As we have seen, oceans cover more than 70 percent of the earth.

Oceans cover more than 70 percent of the earth, as we have seen.

She was awarded a gold medal, which the whole family considered a great honour.

3.　　　 He read such books as will make him wiser.

2.　　　 Here is so big a stone as no man can lift.