He has a bad cold,Mr.Williams,so he must stay in bed for a weekso_其他解答

He has a bad cold,Mr.Williams,so he must stay in bed for a week
so he must stay in bed for a week其中的stay为什么不加S

人气：363 ℃　时间：2020-04-28 06:43:31

解答

must是情态动词~所以后面接的动词都用原型!没有特例!