下面几点是学习名词从句要加以注意的：

1． whether和if都可以引导宾语从句表达“是否”意，（即引导宾语从句时if和whether 可以互换）但以下几种名词从句要用whether（不用if）引导：

（1）引导主语从句，且在句首时。

      例：Whether he has won the tennis is not known.

     (但 It is not known whether/if he has won the tennis).

（2）引导表语从句时。

      例：The problem is whether he can get a job.

（3）引导同位语从句时。

      例：I have no idea whether he will come.

（4）介词后的whether从句。

      例：I worry about whether I hurt her feelings.

2．位于句首引导主语从句的that不可忘。

例如：That he got the first place in the competition surprised all of us.

3． 在“It is suggested/proposed/ordered/a pity/no wonder/necessary/strange/…＋ that从句”结构中，

that从句谓语有时用（should）do这样的虚拟语气形式。

例如：It is suggested that we(should) improve the relations between us.

It is a pity that one(should) stay in one place all one´s life.

It is strange that she should have failed to see her own shortcomings（缺点）.

4． 在“The reason why…is that…”句式中that不要误为because.

例如：The reason why he didn´t go to school yesterday is that he was ill.

5．名词从句中that,what用法比较：

引导名词从句的that是连词，在句中无成份，无意义，而what是连接代词，what＝the thing(s) that.在句中充当成份。

例如： 

I know that he will study.

I know what he will study.

6． where在名词从句中的使用特点：

where在名词从句中有时可以变为“the place where”,有时可以变为“介词＋the place where” 形式。例如：

主从：Where(＝The place where)she has gone is still unknown.

宾从：Would you please tell me where(＝the place where) Mr Smith lives?

表从：Your dictionary remains where(＝in/at the place where)you put.

同位从：Have you any idea where(＝of the place where) she is spending her holidays?

7．无论是哪种名词从句都是陈述语序。例如：

I know where he lives./Please tell me what her name is.

当一个特殊疑问句本身就是陈述语序（即“主＋谓＋（宾）”或“主＋系＋表”结构），将其变为间接引语（即宾语从句）时，无需改变语序。例如：

What´s the matter with him? She asked me what was the matter with him.

Who looks after your grandfather? He asked me who looked after my grandfather.