We have stayed here for two days(改为否定句)为什么是We (haven't) (stayed) here for two days.而不是填hadn't stay
问题描述：
We have stayed here for two days(改为否定句)为什么是We (haven't) (stayed) here for two days.而不是填hadn't stay
答
have不用换时态什么意思?_?had been 结构是在过去完成时才使用，而句子原本就是一般完成时，改否定不用换时态