“TOM must have goodhibits."TOM是第三人称,为什么不能用“has”而用“have”

“TOM must have goodhibits.TOM是第三人称,为什么不能用“has”而用“have” must have Tom’s score on the test is the highest in the class; he ___ last nighta、should studyb、should have studiedc、must have studiedd、must have to study Tom must help his mother ( )Tom,don't play with your toy alone.You must learn to______A have fun B enjoy yourself C share Tom and Mary must travel by ship.Does they really have to travel by ship now?有没有错 must have been done must have done must have/ must have been的区别 what_____ Tom have? ---What ever happened to Tom?---He lost.A.must be B.should have got C.may have got D.might be(为什么是表可能?) must,have to,have got must／have to造句 must have to区别 must not have --I stayed at a hotel while in New York.-- Oh,did you?You ___ with Tom.a.could have stayed b.must have stayed为何选A,选B为何不可,表示你肯定跟TOM呆在一起 Judy ______ be home now.She ______ tennis with Tom.A.can’t; must be playingB.mustn’t; may be playingC.can’t; must have playedD.mustn’t; may have played 摆脱! Judy ______ be home now.She ______ tennis with Tom.A.can’t; must be playingB.mustn’t; may be playingC.can’t; must have playedD.mustn’t; may have played 摆脱! must be must have done 区别