名词性从句作主语：
句子不可以作主语，一定要变成名词性从句作主语。
He doesn't study makes me angry.(wrong)
That he doesn't study makes me angry.(right)
名词性从句包括：主语从句，宾语从句，表语从句，同位语从句。
名词性从句一共有三种：
（1）that 从句
（2）whether从句
（3）疑问词所引导的从句
分项说明：
（1）that从句：任何一个主语起首的句子前面冠以that，即成that从句。
（2）whether从句：本从句是由可用yes／no回答的问句变化而成，这种可用yes／no回答的问句喂一般疑问句。
a.问句有be动词时：主语与be动词还原，前面冠以whether。
Is he happy?
Whether he is happy.
b.问句有一般助动词（can，will, may, should, ought to, must, have）,主语与助动词还原，前面冠以whether。
Can he do it?
Whether he can do it .
c.
