（1）从属连词that.

如：He told us that he felt ill. 他对我们说他感到不舒服。

I know he has returned. 我知道他已经回来了。

I know nothing about him except that he is from the south.（that引导的宾语从句作介词宾语时，that不能省略。）对他我一无所知，只知道他是南方人。

（2）从属连词if/whether.

如：I doubt whether he will succeed. 我怀疑他是否会成功。

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

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

I'll tell you why I asked you to come. 我会告诉你我为什么要你来。

（4）介词宾语从句

宾语从句也可用作介词的宾语。如：

He was deeply displeased by what had occurred that day. 他对那天发生的事感到很不快。

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

Your success will largely depend upon what you do and how you do it. 你是否成功将主要取决于你做什么和怎样做。

难点释疑：

1.如果宾语从句后还有宾语补足语，则用it作形式宾语，而将宾语从句后置。

如：We thought it strange that Xiao Wang did not come yesterday. 我们认为小王昨天没来是奇怪的。

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

2.He is a good student except that he is careless. 他是一个好学生，只是有点粗心。

3.连词whether （…or not）或if引导的宾语从句

if和whether引导的宾语从句可以互换使用，但whether常和or not连用，if一般不与or not连用。

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

4.宾语从句的否定转移。在think，believe，suppose，expect等动词后的宾语从句，有时谓语尽管是否定意思，却不用否定形式，而将think等动词变为否定形式。

I don't think you are right. 我认为你错了。

I don't believe they have finished their work yet. 我相信他们还未完成他们的工作。

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

5.宾语从句的时态变化规律：

（1）当主句是一般现在时态时，从句可根据需要用任何时态。

（2）当主句是一般过去时态时，从句只能使用过去范围内的任何时态。但客观真理除外。

The teacher said that the earth goes round the sun. 老师说地球绕着太阳运行。