When do I have to use être and when do I have to use avoir with the perfect tense?
Être should be used with MRS VAN DER TRAMP verbs (Monter, Retourner, Sortir, Venir, Arriver, Naître, Descendre, Entrer, Rester, Tomber, Rentrer, Aller, Mourir, Partir) and any reflexive verbs (s'habiller, se...