I'm not sure ( ).A.to buy him what B.what to buy for himC.what to him buy D.to want buy him

I'm not sure 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. I'm not sure 快 I'm not sure yet. I'm not sure()( 至今) I'm sorry.I'm late today._______ be late next time.A.Be sure to notB.Be sure that you notC.Be sure not toD.Be sure that you didn't -Can I go out to play now? -______________A.Certainly not! B.I'm afraid not C.Sure not D.Perhaps you can't.选A对吗? He ____have been busy.I'm not sure.A.may B.must C.mustn't D.need I'm sure I am not wrong I'm not sure mens____________ A.I have an idea B.I don't now C.I can't help you D.I'm not right告诉我选哪个就好 I'm not sure.等于may be 还是I don't know I'm not sure what I can buy for my mother.（t同义句转换） I'm not sure ___ ___ ___ for my mother. Are you going to have a piano lesson this weekend?A.Yes,please B.I'm not sure C.No,I won'tD.No,please don't 有没有I’m not too sure? NOW, I'm not sure 什么意思 为什么没有I’m not too sure? ---Don't forget to lock the door!的回答---Don't forget to lock the door!---______.A.No,I'm not B.Yes,I have C.No,I wont D.Yes,I'm sure I'm not sure what I'm in a mood for?是啥意思