I think he can eat an egg!改为否定句为什么是I don't think.

问题描述:

I think he can eat an egg!改为否定句为什么是I don't think.

主句是I think.
he can eat an egg,只是从句,前面省略了引导词that.
将句子改为否定句,自然是改主句,而不是从句,所以要改为I don't think.