Passé Composé of ETRE verbs

auxillary verb is ETRE, not avoir, conjugated to match subject

past participles AGREE in NUMBER and GENDER with the subject

MR. DR. VANDERTRAMPS...mnemonic device to help you remember the ETRE verbs

Infinitive	Meaning	Past Participle
monter	to show	monté
rester	to stay, remain	resté
devenir	to become	devenu
revenir	to come back	revenu
venir	to come	venu
arriver	to arrive	arrivé
naître	to be born	né
descendre	to descend	descendu
entrer	to enter	entré
rentrer	to reenter	rentré
tomber	to fall	tombé
retourner	to return	retourné
aller	to go	allé
monter	to go up	monté
partir	to leave	parti
sortir	to go out	sorti

examples:

Nous sommes allé(e)s	Elle est arrivée
We went	She arrived
We did go	She did arrive
We have gone	She has arrived