Passé composé - Wikipedia
https://en.wikipedia.org/wiki/Passé_composéTo form the past participle for first-group verbs (-ER verbs) and aller too, drop the -er and add -é. To form the past participle for second-group verbs (-IR verbs with -ISSANT gerund), drop the -ir and add -i. To form the past participle for third-group verbs (-RE verbs), drop the -re and add -u. • The irregular past participles (which are often found with the third group verbs) must be memor…