can ,may ,must ,should的意思

can may must 区别是什么? can may must 过去式是什么 might,may,can,must的区别 can,might,may,could,must的用法 can,might,may,could,must的用法 must,need,can,may的否定式? 可能性可能性从小到大must may can can ,may ,must ,should的意思 can be.must be区别may be can、must may would四个的区别, can,may和must的区别是? 助动词：can ,may .must的基本用法! 用can,can't,could,may,must,have to填空. (must/can/may)i return the magazine tomorrow?yes.you(must/can/may).must是只能用在肯定句中吗? You_____go and ask Meimei.She_______know the answer.A,must,can B,must,may C,need,can D,can,may You__go and ask Rice.She __know the answerA.must,may B.need,can C.can,may D.must,can can、could、may 、might、must、ought 的区别和用法 should,must,can,may,shall,could,might的用法