3. The question is ______ this book is worth writing.

2. I don’t know _______ or not I’ll be free tomorrow.

1. I don’t know _______ I’ll be free tomorrow.

2. That you missed the chance is a pity.

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由连词 whether 和 if, 连接代词 what, who, which 和连接副词 when, where, why, how 等引导.也常常后置:

It doesn’t matter if/whether he is a foreigner.

It is a question whether he is willing to come.

It is unknown how she has reduced her weight in such a short time

It 的用法： (形式主语)

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

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

　 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)

It is well known /reported　 / thought/said…　 that…

　It is clear/ necessary/　 certain/ true/doubtful…that…

It is a pity/a shame/an honour/　 that…

It doesn’t matter whether…

It seems that…　

It happens that…

考点二 注意：主语从句中 ，谓语动词一般用单数

What引导的主语从句，可根据表语决定

What he needs _is_ that book?

What he needs _are_ some book?

宾语从句：1.从句在句中充当宾语成分( 可以作谓语动词、介词、形容词，不定式等非谓语动词的宾语)

连词：that, whether, if (that 常可省略) who, what, which, whoever, whatever, when, where,　 why, how

1). They know that the habit will kill them.

2).It all depends on whether they will support us.

3) I am afraid that he didn’t call me.

4).He made it clear to the public that he did an important and necessary job.　　　　

5).I find it necessary that we should do the homework.

用if 或whether 填空

1. That the earth is round is known to all.

--　　　　　　　　　　　

3. That you missed the chance

总结： that 无意义, 后接一个完整的句子，that 不可省。

考点一:主语从句后置!　　

为了避免主语冗长,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。

例:

That we shall be late is certain.

-- It’s certain that we shall be late.

2. That the earth is round

3. ________________________ is a pity. (你错过了这次机会)

Keys

2. _____________________ is known to all. (地球是圆的)

1. That we shall be late is certain.