why,指原因：在"reason"后：

The reason why he was late is that the car broke down on the way.

比较：The reason that he gave us is not reasonable.

(3)the same...as; such...as引导的定语从句：

This is the same pen as I lost yesterday.

You should pay more attention to such mistakes as you made last

time.

This is such an interesting book as everyone likes to read.

(4)定语从句典例：

Li Hua is one of the boys who are never late for school.

(who指boys)

李华是从不迟到的男孩之一。

Li Hua is the only one of the boys who is never late for school.

(who指one)

李华是男孩中唯一从不迟到的。

Is this new teaching building the one you visited last night?

(变为陈述句后，is移到building之后。)

Is this the new teaching building you visited last night?

(变为陈述句后，is移到this之后。)

Who is the man that is talking with our teacher?

(为避免重复，用that不用who)

(5)定语从句应注意的几点：

A. that引导的定语从句与that引导的同位语从句的区别：

The fact that we talked about is very important.

(that引导的是定语从句，that作宾语，可省略。)

The fact that the Chinese invented the compass is known to

all.

(that引导的是同位语从句，that不作成分，不能省略，句子

介绍的是fact的具体内容。)

B.用that不用which：两者都可表物，大部分情况可通用，但下

列情况例外：

先行词为all, few, much, little, nothing, everything, anything等：

All that must be done has been done.

There is little that I can do for you.

先行词被all, few, little, any, the very, the only, first，second,

last或形容词的最高级修饰时：

That's the only thing that we can do now.

This is the best novel that I have ever read.

先行词既有人也有物时：