I'm not sure.等于may be 还是I don't know

He will come .I‘m not sure.A.may B.maybe C.may be D.possible I'm not sure.等于may be 还是I don't know Jay__know the answer,but I'm not sure.A.maybe B.Jay__know the answer,but I'm not sure.A.maybe B.may be C.may D.must She ___ know the answer,but I'm not sure.A.maybe B.may be C.may D.must _____ she is at home ,I'm not sure A,May be. B Maybe. C. May. D. Must Jay__know the answer,but I'm not sure.A.maybe B.may be C.may D.must .She _____ know the answer,but I’m not sure.A.maybe B.may be C.may D.must I'm not sure.It__uncle Li's.A.may B.maybe C.may be D.must be I'm not sure when the train will arrive,I'm afraid.It___be late.A.shall B.will C.may I'm not sure tom___ come to the party tonight.i'm not sure.A.can B may C must D will --Is Mr Brown driving here?---I'm not sure.He___come by trainA.may B.shall C.need D.must He ____have been busy.I'm not sure.A.may B.must C.mustn't D.need 18.I___YOU LATER,BUT I'M NOT SURE YET.A:SEE B:CAN SEE C:AM SEEINGD:MAY SEE he may have telephoned last night,but i'm not sure.may的过去式不是might what't your plan for the May Day holiday,Tom? I'm not sure.I visit the Great Wall.A.may B can C need D must I'm not sure if I'm going to Tom's party;I may go to the concert___A.only B.instead C.early D.late请问为什么? she()konw the answer,but I'm not sure.A.maybe B.may be C.may 为什么捏?我搞不明白他们的用法..请赐教哇,