學(xué)位英語(yǔ)語(yǔ)法知識(shí)（名詞性從句）

名詞性從句用法及示例：

1.引導(dǎo)名詞性從句的連接詞

引導(dǎo)名詞性從句的連接詞可分為三類：

連接詞：that,whether,if(不充當(dāng)從句的任何成分)

連接代詞：what,whatever,who,whoever,whom,whose,which

連接副詞：when,where,how,why

不可省略的連詞：

1.介詞后的連詞

2.引導(dǎo)主語(yǔ)從句和同位語(yǔ)從句的連詞不可省略。例如：

That she was chosen made us very happy.她被選上了，我們很高興。

We heard the news that our team had won.我們聽(tīng)到消息說(shuō)我們隊(duì)贏了。

比較：whether與if均為"是否"的意思。但在下列情況下，whether不能被if取代：

1.whether引導(dǎo)主語(yǔ)從句并在句首

2.引導(dǎo)表語(yǔ)從句

3.whether從句作介詞賓語(yǔ)

4.從句后有"or not"

大部分連接詞引導(dǎo)的主語(yǔ)從句都可以置于句末，用it充當(dāng)形式主語(yǔ)。例如：

It is not important who will go.誰(shuí)去，這不重要。

It is still unknown which team will win the match.到底誰(shuí)贏呢，形勢(shì)尚不明朗。

2名詞性that-從句

1)由從屬連詞that引導(dǎo)的從句叫做名詞性that-從句。That只起連接主句和從句的作用，在從句中不擔(dān)任任何成分，本身也沒(méi)有詞義。名詞性that-從句在句中能充當(dāng)主語(yǔ)、賓語(yǔ)、表語(yǔ)、同位語(yǔ)和形容詞賓語(yǔ)。例如：

主語(yǔ)：That he is still alive is sheer luck.他還活著全靠運(yùn)氣。

賓語(yǔ)：John said that he was leaving for London on Wednesday.約翰說(shuō)他星期三要到倫敦去。

表語(yǔ)：The fact is that he has not been seen recently.事實(shí)是近來(lái)誰(shuí)也沒(méi)有見(jiàn)過(guò)他。

同位語(yǔ)：The fact that he has not been seen recently disturbs everyone in his office.

近來(lái)誰(shuí)也沒(méi)有見(jiàn)過(guò)他，這一情況令辦公室所有的人不安。

形容詞賓語(yǔ)：I am glad that you are satisfied with your job.你對(duì)工作滿意我感到很高興。

2)That-從句作主語(yǔ)通常用it作先行詞，而將that-從句置于句末。例如：

It is quite clear that the whole project is doomed to failure.很清楚，整個(gè)計(jì)劃注定要失敗。

It's a pity that you should have to leave.你非走不可真是件憾事。

用it作形式主語(yǔ)的that-從句有以下四種不同的搭配關(guān)系：

a.It+be+形容詞+that-從句

It is necessary that…有必要……

It is important that…重要的是……

It is obvious that…很明顯……

b.It+be+-ed分詞+that-從句

It is believed that…人們相信……

It is known to all that…從所周知……

It has been decided that…已決定……

c.It+be+名詞+that-從句

R>It is common knowledge that………是常識(shí)

It is a surprise that…令人驚奇的是……

It is a fact that…事實(shí)是……

d.It+不及物動(dòng)詞+that-分句

It appears that…似乎……

It happens that…碰巧……

It occurred to me that…我突然想起……