主語從句
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主語從句

1.定義:用作主語的從句叫做主語從句。

2.構(gòu)成:關(guān)聯(lián)詞+簡單句

3.引導(dǎo)主語從句的關(guān)聯(lián)詞有三類:

(1)從屬連詞that.如:That they were in truth sisters was clear from the facial resemblance between them.

很明顯,她們確是親姐妹,她們的臉型很相似。

(2)從屬連詞whether.如:

Whether he’ll come here isn’t clear.他是否會來這里還不清楚。

(3)連接代詞who,whom,whose,what,which,whoever,whatever,whichever

連接副詞 where,when,how,why.如:

What she did is not yet known.她干了什么尚不清楚。

How this happened is not clear to anyone.這事怎樣發(fā)生的,誰也不清楚。

Whoever comes is welcome.不論誰來都歡迎。

Wherever you are is my home —— my only home.你所在的任何地方就是我的家——我唯一的家。

解釋:

1.主語從句能用it作形式上的主語。常以it作形式主語的句型有:

A.It+be+形容詞(obvious,true,natural,surprising,good,wonderful,funny,possible,likely,certain,probable,etc.)+that從句。如:

It is certain that she will do well in her exam.毫無疑問她考試成績會很好。

It is probable that he told her everything.很可能他把一切都告訴她了。

B.It+be+名詞詞組(no wonder,an honor,a good thing,a pity,no surprise,etc.)+that從句。如:

It’s a pity that we can’t go.很遺憾我們不能去。

It’s no surprise that our team should have won the game.我們沒贏這場比賽真意外。

C.It+be+過去分詞(said,reported,thought,expected,decided,announced,arranged,etc.)+that從句。如:

It is said that Mr.Green has arrived in Beijing.據(jù)說格林先生已經(jīng)到了北京。

It is reported that China has sent another man-made earth satellite into orbit.

據(jù)報道中國又成功地發(fā)射了一顆人造地球衛(wèi)星。

D.It+seem,happen等不及物動詞及短語+that從句。如:

It seems that Alice is not coming to the party at all.Alice似乎不來參加晚會。

It happened that I was out that day.碰巧我那天外出了。

E.It+doesn’t matter(makes no difference,etc.)+連接代詞或連接副詞引起的主語從句。如:

It doesn’t matter whether she will come or not.她是否來這無關(guān)緊要。

It makes no difference where we shall have the meeting.我們在哪里開會毫無區(qū)別。

F.當that引導(dǎo)的主語從句出現(xiàn)在疑問句中時,要以it作形式主語,而把主語從句后置。如:

Is it true that the scientist will give us a lecture next week? 下周那位科學(xué)家將給我們作報告是真的嗎?

Does it matter much that they will not come tomorrow? 他們明天不來很要緊嗎?

G.當主語從句出現(xiàn)在感嘆句中時,要以it作形式主語,而把主語從句后置。如:

How strange it is that the children are so quiet! 孩子們這么安靜真奇怪!

2.注意連接代詞whoever,whatever,whichever等引導(dǎo)主語從句的含義。

Whoever comes will be welcome.(whoever=the person who)來的人將受到歡迎。

Whatever he did was right.(whatever=the thing that)他所做的事情是正確的。

Whichever of you comes in will receive a prize.(whichever=anyone of you who)你們當中不論哪個進來將會得到獎

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