that后面要跟完整的句子
We know that we should study hard我们知道我们应该努力学习
I expect that they will win我预料到他们会赢
He made it quite clear that he preferred to study English他很明确地说他宁愿学习英语
You may rely on it that i shall help you你可以指望我会帮助你
注意think believe suppose 后面的that一般都省略.