将"The boy is buying a new bike"改为否定句和疑问句及肯定和否定回答

问题描述:

将"The boy is buying a new bike"改为否定句和疑问句及肯定和否定回答

the boy isn't buying a new car
IS THE BOY BUYING A NEW CAR?
YES HE IS/. NO HE ISN'T