that引导的从句可作it的同位语从句。如:
You may depend upon it that all the goods will be delivered in time.
2.that引导宾语从句时可省略;引导其他名词性从句时,一般不省略,特别是引导主语从句且位于句首时。如:
That the earth is round is true.
The fact that he is a thief got around.
注意:下面一句中,第一个that可省略,第二个that不可省略:
He said(that) he had been working here for ten years and that he wanted to go home.
3.whether与if引导名词性从句时的区别。
(1)在引导宾语从句时whether与if可互换,但如果和or not连用则只用whether。如:
I don’t know whether or not he can stay here longer.
(2)如果宾语从句是否定结构,则用if而不用whether引导。如:
He asked me if I wasn’t going there.
(3)介词宾语从句只能用whether引导。如:
I’m not interested in whether he is rich.
(4)引导主语从句、表语从句或同位语从句一般多用whether。如:
The question is whether you can do it yourself.
The question whether he will come here himself isn’t decided yet.
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