Is this your pen ? 答案是 Yes , it is.为什么No,it isn't.不对?谢谢

Is this your pen Is this his pen?选择疑问句 This not is your pen,your pen is white.改错 连词成句：this ,your ,is ,pen ,. Is This your pen?No ,it's__________ Is this your pen?同义句转换 ______me,Tony.Is this your pen? Is this your pen怎么解释? Is this your pen 下一句是什么? E____me.Tim.Is this your pen? Is this your pen?Yes,___(thank). Is this your pen?--( ).---Is this your pen?A.pardon B your pardon c I beg is this your pen?----yes,it's. 改错 is this a pen ___ your pencil case This is a new pen.( ) it in your pencil case This is _____（definite) a letter from your pen-friend Is this your pen变成肯定句和否定句 is this your pen（变为肯定句） Is this your pen?（做否定回答）