What__和that_在名词性从句中的用法区别

what和that 在名词性从句中的用法区别what和that 都可以引导名词性从句。

一．在引导名词性从句时，从属连词that一般要注意三个不（three nos）：

1．不省略

当从属连词that引导主语从句、表语从句和同位语从句时，that不省略。

Eg. 1) That he was able to come made us happy.

2)The truth is that I

didn’t go there.

3)The news that our team has won is true.

that在宾语从句中不能省略的情况.

(1).在主+谓+it(形式宾语)+宾补+that，从句(真正宾语) 的句型中不省略.

Eg: He made it quite clear that he preferred to study English.

(2).由连词and连接的两个

由that引导的宾语从句中, 则第二个宾语从句前的that 不省略。

Eg: He told me (that) he would come and that he would come on time.

（第一个that可以省略，但第二个that不可以省略。)

2．不作成分

that 在名词性从句中不作任何句子成分。

Eg. 1)Sydney kept his

promise that he

would always do

anything he could

for Lucie to make

sure of her

happiness.（that引

导同位语从句）

2)That you don’t like

him is none of my

business. (that引导

主语从句）

3．没词义

that 在名词性从句中没有汉语意思。

Eg. 1)That she is a rich woman is known to us. (that 引导主语从句)

2）The thought that he might fail in the exam worried him. (that引导同位语从句）

二．在引导名词性从句时，what一般要注意一个有（meaning）,一个作（component）：

eg.

1) What I had for breakfast

today was rice with egg.(what 在句中引导主语从句，what是had的宾语)

2）I wonder what we can do. (what引导宾语从句，在句中做do的宾语）

3) This is what she wanted to show us. (what引导表语从句，在句中做show的宾语）

三．两个注意：

1. What所引导的从句可以在介词后作宾语，而that从句一般不可以。

Eg：

After months of voyage, Columbus arrived in _____later proved to be a new continent.

A. where

B. which

C. what

D. that

评析：答案是C。因为在介词in 后面，应该用what引

导的宾语从句，what在宾语从句中作主语。

He was astonished to find the floor covered with _____looked like tiny insects.

A. that

B. something

C.

what D. anything

评析：答案是C。因为在介词with 后面，应该用what 引导的宾语从句，what在宾语从句中作主语。

2.that可以引导定语从句，但what不可以引导定语从句, what只引导名词性从句。Eg:

All _____I want to know is what he meant.

A.that

B. which

C.

what D. whatever

评析：答案是A.本题是that 引导的定语从句。而what 不可以引导定语从句。又因为先行词是all，故其后不可

以接which 引导的定语从句。

______impressed me most was ______such a little boy could play the violin so well.

A.That ; what

B. What ;

that C. That ; that D.

What ; what

评析：答案是 B.第一空是what 引导的主语从句，并在主语从句中作主语。第二空是that 引导的表语从句，

that在表语从句中不省略，不作成分，也没词义。

练习：

一．改错题：

1.What we all like him is certain.

2.He left is certain.

３．I wished that we could go to Beijing this summer and we could buy some books on our way back

4.His delay is due to the fact the car went wrong