The cup on your desk isn't clean.什么意思?

Is this your pen?No,it isn't.Mine is on the desk.这里的Mine用的对么 英语翻译There is a book on the desk,________A:ins't thereB;isn't There ___books on the desk.A isn't B is C aren't D have The calculator on the desk isn't yours.It belongs to( ).A.mi The calculator on the desk isn't yours. It belongs to ___. A what' s this in English?Your box isn't in the desk?句型转换 Isn't there a bird on the desk?（回答有） There isn't any thing on the desk （同义句） There isn't book on the desk.这句话有个错误,在哪? The pen on my desk,it isn't mine合并成定语从句 This isn't ( ) book .my book is on the desk.填空,谢 There isn't any lamq on the desk 求修改病句