he must stay in bed for a week.这句话中主语是第三人称单数stay为什么不用stays?
问题描述:
he must stay in bed for a week.这句话中主语是第三人称单数stay为什么不用stays?
答
must 是情态动词,情态动词后加动词原形
he must stay in bed for a week.这句话中主语是第三人称单数stay为什么不用stays?
must 是情态动词,情态动词后加动词原形