[讲一讲] 同学们在学习和使用名词性从句时要特别注意以下几点：
1. 注意连接词that与what的区别：
that在引导名词性从句时，只起连接作用，不在从句中作任何成分；what在引导名词性从句时不仅起连接作用，而且在从句中充当主语、宾语、表语等。如：
See the flags on top of the building? That was what we did this morning. （what作did的逻辑宾语）
What makes this shop different is that it offers more personal services. （what引导主语从句，且在主语从句中作主语）
2. 注意连接词whether与if的区别：
whether可引导所有的名词性从句，if一般只能引导宾语从句。在引导宾语从句时两者常可互换，但介词后的宾语从句只能用whether引导；此外，whether后可直接用or not, if则不行。如：
The question is whether he will accept our invitation and come to our party. （whether引导表语从句，一般不用if代替）
Can you tell me whether or not the train has left? （与or not直接连用，只能用whether）
3. 注意名词性从句与定语从句的区别：
名词性从句相当于一个名词，在句中可以充当主语、宾语、表语等，而定语从句相当于一个形容词，在句中充当定语。
有些连接词如that, which, where, when等，既可引导名词性从句又可引导定语从句；还有些连接词如what, whatever等，不能引导定语从句。如：
He promised to do everything that he could do to help us out. (that引导定语从句)
He promised to do whatever he could do to help us out. (whatever引导宾语从句)
The coat is still where you have left it. (where引导表语从句)
The coat is still in the room where you have left it. (where引导定语从句)
[练一练]
I. 下列各句均有一处错误，请指出并改正。
1. What fashion differs from country to country may reflect the cultural differences from one aspect.
2. They want to make it clear to the public they are doing an important and necessary job.
3. The problem is why you can’t force everyone to listen to you.
4. No one can tell exactly that man will look like in a million years.
5. I just have no idea that he has been so excited these days.
6. Police were called in to find out that caused the big fire.
7. It is required we should have a class meeting to discuss the problem.
8. The doctors really doubt that my mother will recover from the serious disease soon or not.
II. 根据括号内的提示，将下列句子补充完整。
1. ___________________ (她和同学们相处得很好) is known by us all.
2. The problem is ___________________ (吸烟者没有烟抽便过不下去).
3. Everyone could see what was happening and ___________________ (她很着急).
4. Paul considered ___________________ (他被哈佛大学录取是幸运的).
5. ___________________ (你应该对老师讲的课做好笔记，这很重要。)
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