Are your hands clean (做否定回答）

Are your hands clean (做否定回答） Are these your keys?做否定回答 Are your hands clean? Sorry. Go and ________________ first. Are those your books?（否定回答） are your father and mother free today?(做否定回答） they are toys Are your pens in the pencil box?(做否定回答) Are your friends watching TV做否定回答 clean your hands at o() Are they swimming?(做否定回答） what are those?（做否定回答） Are you and your parents happy?(作否定回答） Are these your dictionary?（ 作否定回答）