名词性从句包括主语从句，宾语从句，表语从句和同位语从句
分为三类：
that从句
whether从句
特殊疑问词引导的从句
1.that从句—任意一个句子前加that
That there exsits a lot of work to do.
2.whether从句
①问句有be动词，主语与be动词还原
Is he happy.
Whether he is happy
②问句中有一般助动词(have, can, should, will, must, outght to, may)
Can he do it?
Whether he can do it?
Has he done it?
Whether he has done it.
③问句中有do,does,did—去掉，其后动词依人称和时态变化
Did he come?
Whether he came
Does he like it?
Whther he likes it.
3.疑问副词—why,how,what,where,when
情况和whether完全一致
What he is doing?
What he is doing?
What can he do?
What he can do?
What did he write?
What he wrote?
注意：who,what,which若在句中作主语，变名词性从句，结构不变
Who came here?
Who came here.
Which was bought.
What happend last night.
1.作主语
That honesty is the best policy is a proverb(that) we should always keep in mind.
=It is a proverb(that)we should always keep in mind that honesty is the best policy.
2.做及物动词宾语
I do not know how he will handle it.
3.作介词宾语—只能用whether或特殊疑问词
I am worried about whether he can do it.
I am cruious about how he will cope with the problem.
注意：介词后不能加that做介词宾语
I am sure of that the team has won the game.(X)
正确写法：
I am sure of the fact that the team has won the game.
I am sure of the team’s winning the game.
I am sure that the team has won the game.
I am happy about that he may/can come.(X)
正确写法：
I am happy about his bening likely to /bening able to come.
Tips:
特殊用法
in that=because
He is talented in that he can speak five diffrent five language.
Hi is nice except that sometimes he lies.
except that
He is nice except that sometimes he lies.