Bonjour
est ce que la phrase "Elles se sont lavées les mains" contient un participe passé mal accordé?
==> OUI
the correct answer is = "Elles se sont lavé les mains"
The pronominal verbs don't agree with the subject.
It's the same rule than with the participle with "avoir"
They agree with the direct object if it is before the verb.
which mean they agree with the reflexie pronoun if this one is the direct object
===> Elles se sont lavées > Elles ont lavé qui ? => elles-mêmes
they washed who ? > themselves
the direct object is the reflexive pronoun which is before the verb => the past participle agree with it
BUT
-===> Elle se sont lavé les mains > elles ont lavé qui ? leurs mains
they washed what > their hands
the direct object is after the verb. The past participle doesn't agree
-
hope this helps:)