I have no idea____he will come back from work.为什么不填that?

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Ihavenoidea____hewillcomebackfromwork.为什么不填that?Ihavenoidea____hewillcomebackfromwork.为什么不填that?Ihav

I have no idea____he will come back from work.为什么不填that?
I have no idea____he will come back from work.
为什么不填that?

I have no idea____he will come back from work.为什么不填that?
填that表示是that引导的同位语从句,但idea 跟he will come back from work并不是等价的,所以二者并不是同位语;
相应的,idea 跟 whether he will come back from work 是等价的

我不知道他是否会下班回来。
后面的句子是带有疑问语气的。”是否“

中间的空可以省略,这个定语从句中的that后面只带事物,that可以省略