陈述句是复合句的反意疑问句
一、一般原则
在通常情况下，陈述句是主从复合句时，简略问句的主语和助动词要与主句保持一致。如：
She said that I did it, didn't she? 她说是我干的，是吗？
They know how much it cost, don't they? 他们知道这花了多少钱，是吗？
二、特殊情况
当陈述句部分是I believe / think / suppose 等加宾语从句时，简略问句与宾语从句一致，但要注意否定转移。如：
I think that he is wrong, isn't he? 我认为他错了，是吗(他错了吗)?
I don't think he likes it, does he? 我认为他不喜欢它，是吗(他喜欢吗)?
I don't suppose he will come, will he? 我想他不会来了，是吗?