题目内容：

must的后面加动词什么形式?

优质解答

must 是情态动词.所以要接动词原形了
如:
The teacher said,"You must get back before 10 o'clock."
----The teacher said that we must get/go back before 10 o'clock.
虽然must 在两个句中的时态不同,但作为情态动词must可以用语各种时态,形式不变.