i have no idea that he will come back.

问题描述:

i have no idea that he will come back.
i have no idea that he will come back.可不可以看成THAT引导的同位语从句?

句子是对的,但意思是“我对他将要回来一无所知”.
如果想说.他是否会回来我一无所知,应该是:I have no idea whether/if he will come back.换成IF也可以吗?if不是不可以引导同位语从句吗?whether是最好的,但用if也可以。THANKYOUyou are welcome.