这句英语为什么这么说?

题目

这句英语为什么这么说?
Ann doesn't seems very happy at the moment
为什么不是ISN'T呢?
seem后没有s啊~多打了

答案

因为seem是一个不及物动词,对动词的否定和疑问只能用doTake a sentense as a case in point:How does he seem?他看来怎么样?It didn't seem possible.这似乎是不可能的.That doesn't seem likely.那看来不可能....