it could be ...that能够引导强调句吗

问题描述:

it could be ...that能够引导强调句吗
我记得貌似be动词只能是was或者is,最多出现it might be或者it must have been啊

这句应该跟It might be...that一样的结构,只是语气上的差别,我以为可以引导强调句.