（1）從屬連詞that.

如：He told us that he felt ill. 他對我們說他感到不舒服。

I know he has returned. 我知道他已經(jīng)回來了。

I know nothing about him except that he is from the south.（that引導(dǎo)的賓語從句作介詞賓語時，that不能省略。）對他我一無所知，只知道他是南方人。

（2）從屬連詞if/whether.

如：I doubt whether he will succeed. 我懷疑他是否會成功。

I don't know if you can help me. 我不知道你能否幫助我。

（3）Who or what he was, Martin never learned. 他是什么人？他是干什么的？馬丁根本不知道。

I'll tell you why I asked you to come. 我會告訴你我為什么要你來。

（4）介詞賓語從句

賓語從句也可用作介詞的賓語。如：

He was deeply displeased by what had occurred that day. 他對那天發(fā)生的事感到很不快。

I am curious as to what he will say. 我很想知道他要說什么。

Your success will largely depend upon what you do and how you do it. 你是否成功將主要取決于你做什么和怎樣做。

難點釋疑：

1.如果賓語從句后還有賓語補(bǔ)足語，則用it作形式賓語，而將賓語從句后置。

如：We thought it strange that Xiao Wang did not come yesterday. 我們認(rèn)為小王昨天沒來是奇怪的。

He has made it clear that he will not give in. 他已表明他不會屈服。

2.He is a good student except that he is careless. 他是一個好學(xué)生，只是有點粗心。

3.連詞whether （…or not）或if引導(dǎo)的賓語從句

if和whether引導(dǎo)的賓語從句可以互換使用，但whether常和or not連用，if一般不與or not連用。

I wonder whether it is true or not. 我不知它是真是假。

4.賓語從句的否定轉(zhuǎn)移。在think，believe，suppose，expect等動詞后的賓語從句，有時謂語盡管是否定意思，卻不用否定形式，而將think等動詞變?yōu)榉穸ㄐ问健?/p>

I don't think you are right. 我認(rèn)為你錯了。

I don't believe they have finished their work yet. 我相信他們還未完成他們的工作。

I don't suppose he cares, does he? 我想他不在意，是嗎？

5.賓語從句的時態(tài)變化規(guī)律：

（1）當(dāng)主句是一般現(xiàn)在時態(tài)時，從句可根據(jù)需要用任何時態(tài)。

（2）當(dāng)主句是一般過去時態(tài)時，從句只能使用過去范圍內(nèi)的任何時態(tài)。但客觀真理除外。

The teacher said that the earth goes round the sun. 老師說地球繞著太陽運行。