引导宾语从句的连词that 通常可以省略：
She said (that) she would come to the meeting. 她说过要来开会的。
I promise you (that) I will be there. 我答应你我会去。
I hoped (that) I would / should succeed. 我曾希望我会成功。
He thinks (that) they will give him a visa. 他想他们会给他签证。
He thought (that) they would give him 3 visa. 他本想他们会给他签证。
I expect (that) the plane will he diverted. 我料想飞机会改变航线。
I expected (that) the plane would be diverted. 我本料想飞机会改变航线。
Everybody knows (that) money doesn't grow on trees. 众所周知，金钱是不会从树上长出来的。
I suggested (that) they should / shouldn't drive along the coast. 我建议他们沿着 / 不要沿着海岸开车。
【注】有时为了强调，that引导的宾语从句可位于句首，此时that不可省略：
That she is a good girl I know. 她是一个好姑娘，我是知道的。