10-名词性从句之表语从句

定义：表语从句就是用一个句子作为表语。
表语的作用：说明主语是什么。可以由名词、形容词或相当于名词或形容词的词或短语充当表语的成分。

The problem is easy.
The problem is when we can get a pay rise.

The reason he did not come is that he was ill.
The fact is that he is ill.

the question is whether he is responsible.

That is why I was late.
the problem is who can do the work.
it looks as if it is going to rain.
The question is whether we shall stay here or not.