In Le Passé Composé, most verbs use avoir as the auxiliary verb but a fixed number of verbs use être instead.
They are almost all verbs to do with movement (See Conjugate coming and going verbs (+ être) in Le Passé Composé (conversational past)), but also those to do with states of being (birth, death, becoming, staying).
Have a look at the following examples:
Je suis né en avril.I was born in April.
Marie, tu es restée avec Lucas hier.Marie, you stayed with Lucas yesterday.
Il est mort l'année dernière.He died last year.
Nous sommes devenus bons amis.We became good friends.
Vous êtes restées dans le train.You stayed on the train.
Elles sont devenues danseuses.They became dancers.
The pattern for these verbs in Le Passé Composé:
être (le Présent) + past participle of the verb
Because they're using être as auxiliary verb, their past participles have to agree with the subject of the verb.
List of the "being and state" verbs and their past participles
Mourir (to die) –> mort
Naître (to be born) –> né
Décéder (to decease) –> décédé
Devenir (to become) –> devenu
Rester (to stay / remain) –> resté
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