请问英语介词he must stay in bed for a week

请问英语介词he must stay in bed for a week so he must stay in bed for a week.句中stay为什么不加s He must stay in bed for a week改为一般疑问句 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? he must stay in bad for a week 怎么翻译 英语第三人称问题He msut stay in bed for a week这意味什么stay不加s? so he must stay in bed for a week因此他必须卧床一周 这句话he是第三人称为什么动词st he must stay in bed. He has a bad cold,Mr.Williams,so he must stay in bed for a w tom is till .he must stay ( ) for tow days a.in zhe bed b.in How____________________?He must stay in bed for five days. His doctor asked him to stay in bed for a week,__ advice he