He can't be at home.为什么在at前面有be?什么情况下要加Be?

He can't be at home.为什么can't后要加be? He can't be at home.为什么在at前面有be?什么情况下要加Be? he can't be at home与he may not be at home有什么不同?跪拜请求指点迷津. Today is Wednesday.He _______be at home.He ______ be at school.A.can’t,can B.can’t,must C.mustn’t,must D.mustn’t,can He can't be at home.He went to the cinema.合并成一句话 ---Where is your brother?Is he at home?---No,he_____ be at home.He has gone to England.A.must B.mustn’t C.can’t D.may Bob must be at home,________?A.mustn't he B.can't he C.isn't he D.doesn't he 选哪一个?为什么? can't be at home可以转换成can't stay at home吗 Today is Wednesday.He _______ be at home.He _____ be at school.A.can’t,can B.can’t,must C.mustn’t,must D.mustn’t,can he can't be at school反义疑问句he can't be at school.反义疑问句 关于He can't be at home,isn't he?此句是否为反义疑问句?请问和He isn't at home,isn't he?有什么关系?为什么?也请解释一下“can't”在此处的意思.He must be a doctor,isn't he?You must have studied English for three years, Bob____at school.He is at home.【can't,isn't,aren't,don't,doesn't】 He must be playing computer games at home,isn't he,为何用isn't he? Tom _______(can’t/mustn't) be at home .he said he would go to Lily‘s party in the afternoon.如题,请讲一下理由. Simon _____ be at home .He is on the playground.A.can't B.mustn't C.may not D.isn't simon --- be in the classroom.he'sill and stays at home.A.isn't B.mustn't C.may not D.can't There can't be anyone at home,___?A.is thereB.can therewhy we choose A Look!the light is not on in jack's room he-at homLook!the light is not on in jack's roomhe-at home.是mustn't be or can't be