He loves cooking, doesn't he? OR He love cooking, doesn't he? Do we need "s" at the end of "love" if we are using "does not"?
Excellent question! Unlike the regular question format where the "s" is dropped when the tense is third-person singular (e.g."Does he love cooking?"). Affirmative and negative tag questions follow the same rules as if you were making a statement (e.g "He loves cooking, doesn't he?" "He doesn't like cooking, does he?").