What is the past participle of doesn't?

Answer 1

doesn't doesn't have a past participle.

Doesn't is the negative form of do. It is used to make negative sentences with third person singular subjects or singular noun subjects.

She doesn't like kimchi. - negative sentence third person pronoun subject.

The dog doesn't like kimchi - negative sentence singular noun subject.

The past participle of do is done. The negative is haven't done or hasn't done.

She has done gymnastics for years. - positive sentence using past participle of do.

He hasn't done gymnastics since last year. - negative sentence using past participle of do.

Answer:

Didn't.

Answer 2

The past participle of "doesn't" is "didn't."