It could be a boy .(作否定判断）

Is it a culer?(作否定回答） I'm a thin boy.(改一般疑问句,并作否定回答） Is it a bag?作否定回答 It must be a spaceship(改为否定句） Could I use your English book?（作否定回答） it could be better. Could It Be 歌词 could it be歌词 There will be a meeting tomorrow.(改为一般疑问句作否定回答） ——------ --- Will there be a balcony?【作否定回答】 If you could choose,would you like to be a boy or a girl?Try Isn't it a nice day?如何作否定回答