The baseball is on the sofa做否定回答

The baseball is on the sofa做否定回答 Is the baseball on the sofa?做否定回答 Is the baseball on the sofa?(作否定回答) Where are my keys?将答语补充完整.Is the baseball on the sofa?做否定回答 The baseball is on the sofa（改为否定句） Is the baseball on the sofa? The dog is sieeping on the sofa.(改为否定句,疑问句并做回答) The baseball is on the sofa.怎样变为一般疑问句? That is a bag.改为复数句 The baseball is on the sofa改为否定句 Are the the keys are on the sofa 改为一般疑问句 并做否定回答 My book is on the sofa （变为一般疑问句并否定回答) Is the pencil case under the sofa? 作否定回答