高一英语名词性从句讲解(2)

名词性从句

1. 种类

2.宾语从句的时态。

3. that什么情况下可以省略，什么情况下不可以省略。

4. whether 和if 什么时候可以互换，什么时候不可以互换。

5. 如何区分同位语从句与定语从句。

完成以下题目，并分别指出它们是什么从句

1.______ the baby could speak made his parents very happy.

A. That

B. What

C. Why

D. If

2. I wonder ______ you will go shopping or stay at home.

A. that

B. if

C. whether

D. what

3. This is ______ he was often late for school.

A. what

B. that

C. why

D. whether

4. We all know the truth ______ the earth ______ around the sun.

A. if; moved

B. that; moves

C. why; move

D. whether; move

一．名词性从句的概念：一个句子在连接词的引导下，在句子中起名词作用的句子叫名词性从句。二．名词性从句的功能：相当于名词词组, 它在复合句中能担任主语、宾语、表语、同位语、介词宾语等。

His job is important. (主语)

What he does is important. (主语)

This is his job. (表语)

This is what he does every day. (表语)

I don’t like his job. (宾语)

I don’t like what he does every day. (宾语)

I don’t know about the fact that he is a teacher.(同位语)

I don’t know about the man, Mr. White. (同位语)

得出结论：因此根据它在句中不同的语法功能，名词从句又可分为四类，即：主语从句、宾语从句、表语从句和同位语从句。

三．引导名词性从句的连接词：

1、连接代词：who, whoever, whose, whom, whomever, what, which。有词义，在从句中担任成分，如主语、表语、宾语、或定语等。

●I don’t believe __________ he has achieved so far.

●__________ breaks the law should be punished.

2、连接副词：when, where, why, how。有词义，在从句中担任成分，作状语。

●__________ we will hand in the project will be discussed later.

●Parents are thought to understand __________ important education is to their children’s future.

●The reason __________ he was absent was that he was ill.

3、连接词：that, whether, if, as if, as though。that 无词义，在从句中不担任成分，有时可省略；if (whether), as if虽有词义，但在从句中不担任成分。

●I don’t care about __________ you have money or not.

●The problem is __________ Tom is able to arrive on time.

●__________ the meeting will be held here is not decided yet.

●It looks __________ it is going to rain.

●The truth is __________he didn’t come for the concert.

●__________ the earth is round is true.

四．名词性从句的类型：

1. 主语从句：在复合句中作主句的主语。连接词有that, whether; who, what ,which; when ,where, how, why 等。如:

●__________ he is a famous singer is known to us.

●__________ he will go to America is not yet fixed.

●__________ she’s coming or not doesn’t matter too much.

●__________ broke the glass yesterday is not clear.

注意：

1. 为避免主语冗长,句子头重脚轻, 经常用it作形式主语, 主语从句放在后面作真正的主语。

记住以下it作形式主语的句型：

It’s likely / possible / important / necessary / clear that…很可能/ 重要的是… / 必要的是… / 很清楚…

It’s said / reported that…据说/据报道…

It seems / appears / happens that…显然、明显、碰巧…

It’s been announced / declared that…已经通知/宣布…

It’s no wonder that…并不奇怪/无疑…

It’s a pity/a fact /a common knowledge (众所周知）/ a common saying（俗话说）that…

●It worried her a bit ______ her hair was turning grey.

A. while

B. that

C. if

D. for

●It remains a question ______ we can get so much money in such a short time.

A. how

B. that

C. when

D. what

●It is known to us ______ where there is pollution, there is harm.

A. which

B. where

C. what

D. that

2.单个的主语从句作主语时，谓语动词用句单数形式；如果是两个或两个以上的主语作

主语，谓语动词则视情况而定。

When and where he was born hasn’t been found.