I'm not sure he can swim 改为否定句

I'm not sure he can swim 改为否定句 Where's Jeff?I'm not sure.--Where's Jeff?--I'm not sure.He ___ be playing football on the playground.A needB mightC mustD can I'm not sure - Can he arrive on time? - . But I’m not sure. A. He must be B. Maybe he can C. He may can D. He- Can he arrive on time? - . But I’m not sure. A. He must be B. Maybe he can C. He may can D. He may be说明理由 用must,can't改句子I'm sure that he is a middle school teacher.I'm sure that she is not playing the piano. He be married,but I'm not sure. I'm not sure 快 I'm not sure yet. I'm not sure()( 至今) He ( ) a little late,but I'm not sure .A.maybe B.may be C.can't be D.can be I'm not sure which room he lives in.这个句子为什么不能写作 I'm not sure which room does he live in.或者I'm not sure in which room does he live . 用must,can't改句子1.I'm sure that the Yellow River is not longer than the Yabftze River.2.I'm sure that he is looking for you. Tom sounds very much interested in the job,but I'm not sure whether he can manage it.翻译句子,并指出sound的意思. ---Isn't that Ann's husband over there?---No,it___be him---I'm sure he doesn't wear glassesa:can'tb:must notc:won'td:may not I'm not sure whether I can complete the work on time.这句话对吗 I'm not sure.Ask Jim.He m＿ know the answer. I'm sure I am not wrong 同义句转换：I'm not sure what I can buy for my mother..I'm not sure ---- ---- ---- for my mother.