He likes singing.
Does he like singing?
请及时采纳,多谢!不是说does后面用动词原形吗？你看清楚，Does he like singing？这句话does后面的动词是谁？是like。它用原形了吗？用了。所以说does后面用动词原形。至于like后面的singing则跟你说的无关。