Why 'they stayed' is 'elles sont restées' not 'elles ont restées' or 'elles restèrent'?
In duolingo's french grammar coures, it says : 'when talking about the past, verb that indicate motion or change of state use être'. Does the verb ' rester' indicate any change in state or motion? Merci!
The reason why you must use << être > as your auxiliary verb in this sentence instead of << avoir > (elles sont restées and NOT elles ont restées) is because rester is one of the verbs that must be conjugated with être. The acronym that I always learned in school to help remember these verbs is DR. MRS. VANDERTRAMP: (Devenir, Revenir, Monter, Rester, Sortir, Venir, Aller, Naître, Descendre, Entrer, Rentrer, Tomber, Retourner, Arriver, Mourir, Partir) If you take a look at these verbs, something that they all have in common is that they express a motion or an overall state of being. Rester (to stay) falls into this category because it is the opposite of aller (to go). I hope this helps a bit and helps you to remember these verbs :)
Hm, 'rester' doesn't indicate a change in motion, no, but it does have to do with motion. I believe there are only fourteen verbs (not including the reflexive verbs) that use 'être' as the auxiliary in the passé composé, so you could probably learn them by heart. A good mnemonic for this is the 'maison d'être'.
I also found a related video for people whose french is not that good (like me) , their video have english subtitles :https://www.francaisavecpierre.com/auxiliaire-etre-ou-avoir/