Is Guo Peng your brother?否定回答?

Is Guo Peng your brother?否定回答? Is Guo Peng your brother 的否定回答 She is my sister.改为否定句 Those Guo Peng is his brother.怎么改为否定句 —Is Guo Peng your brother?—No,he isn't.这句 Is Guo Peng your friend?回答是：Yes ,it is.还是回答：Yes ,he is. 3.Is he / Guo Peng your brother?他 / 郭鹏是你的哥哥吗?Yes,he is./ No, Is Tim your brother?（作否定回答 Is this your brother?(做否定回答) Is that your brother?做否定回答 is the boy your brother做否定回答 Is Guo Gang your brother?的同义句 Is Guo Gang your brother?(改为同义句)