Être and avoir as auxiliary verbs
Both verbs form compound tenses (like the passé composé) with a past participle. Their own participles are été (être) and eu (avoir), and être's compound tenses are built with avoir: J'ai été clair ? → Was I clear?
Avoir is the auxiliary for the large majority of verbs, including all transitive verbs (those taking a direct object) and impersonal weather/necessity verbs:
- J'ai écouté ta chanson. → I listened to your song.
- Nous avons acheté des bananes. → We bought bananas.
- Il a plu tout le mois. → It rained all month.
- Le chiffre d'affaires a augmenté de 30 %. → Turnover rose by 30%.
Être is the auxiliary for a set of intransitive verbs of movement and change of state, and for all pronominal (reflexive) verbs and the passive:
- Lorsque Joe est arrivé, il n'y avait personne. → When Joe arrived, no one was there.
- Quand il s'est levé ce matin, il faisait encore nuit. → When he got up this morning, it was still dark.
- La carte est maintenant perdue. → The map is now lost.
The être verbs: DR MRS VANDERTRAMP
The verbs that take être are often remembered with the mnemonic DR MRS VANDERTRAMP: Devenir, Revenir, Monter, Rester, Sortir, Venir, Aller, Naître, Descendre, Entrer, Rentrer, Tomber, Retourner, Arriver, Mourir, Partir. With être, the past participle agrees with the subject: Elle est allée, ils sont partis.
Verbs that take either avoir or être
A few verbs (monter, descendre, sortir, passer, retourner) take être when used intransitively and avoir when used with a direct object, and the meaning shifts:
- Je suis monté au sommet. → I went up to the top. (être, intransitive)
- J'ai monté les valises. → I took the suitcases up. (avoir, transitive)
- Il est descendu à la station. → He got off at the station. (être)
- Avez-vous déjà sorti le chien ? → Have you taken the dog out yet? (avoir)
The other tenses
The full subjunctive, conditional, and compound-tense conjugations of être and avoir (built from the simple tenses above plus the participles été and eu) are provided in the tables that follow on the page; they are regular in construction once you know the simple tenses. For example, the passé composé of être is j'ai été, tu as été, il a été…