当一个子句充当句子的表语时，这个子句就叫做表语从句。如：

My idea is that he can teach children English in this school. 我的想法是他能够在这所学校教孩子们英语。

My hope is that he will keep it a secret for ever. 我的希望是它将永远保守秘密。

表语从句中应注意：

1. 连接词that一般不能省略，但当主句中含动词do的某种形式时，that可以省略。如：

What I want to do is (that) I can go up to him and thank him. 我想做的事是走到身边去感谢他。

2. 当句子的主语是：advice, demand, decision, desire, idea, insistence, instruction, order, plan, proposal, recommendation, request, requirement, suggestion, wish等名词时，表语从句须用虚拟语气，即：should +do。如：

My advice is that you should go to apologize to him. 我的建议是你应该去向他道歉。