I’m not sure that is it free?I want to make sure that is it free?哪句表达想向对方确定某项事物比较好?

This sure is light,because I'm not that strong! 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. There is ____ that he may come ,but I'm not sure .(possible) i'm not sure ______ he is speaking at the meetingA that B who Cwhether Dwhat I'm not sure I'm not sure of that ,And I think he is probably at home .此句中的that I am not sure if she is from Canada.还是I am not sure that she is from Canada.原题 is she from Canada?i'm not sure.合并为一句 I'm sure your update status is not talking about me.but I just assume that I求介绍 I'm not so sure about that...的中文翻译 I'm not sure 快 I'm not sure yet. I'm not sure()( 至今) I'm sure there is no h_____ in doing that I'm sure there is no h____ in doing that I'm not sure of that .He is going to Shanghai(将两句话合并成一句话）I'm not sure _____ he is going to Shanghai ______ _______ . 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. I’m not sure that is it free?I want to make sure that is it free?哪句表达想向对方确定某项事物比较好? I'm not sure whether this is the room ______ she left her dictionary.A.where B.that C.which D.in that回答加解释.