I think that will be very happy.这句话有没语法错误?

问题描述:

I think that will be very happy.这句话有没语法错误?
I think that will be very happy.
能这样说吗?有这样说的么?
不地道 “省略了that 而已 ”……什么……意思?

句子本身是这样的I think (that) that will be very happy
这里第一个that
就是括号里的是无意的
就是【i think that +句子】的形式
而后面一个就是表示后面这个句子的主语
以上