French verb conjugation sites don't agree

Question

Looking for more detail on these verbs, I couldn't find ANY French verb conjugation sites that conjugated verbs like AMUSER, MAQUILLER, REPOSER, or even DÉCÉDER with ÊTRE. They all use AVOIR. Why is that?

Accepted Answer

Hi Donna, 
It is because all of these verbs are mainly use as reflexive verbs -
s’amuser, se maquiller, se reposer, se décider
As such they all take theauxiliary être.
https://french.kwiziq.com/revision/grammar/conjugate-reflexive-verbs-in-the-passe-compose-conversational-past
Hope this helps!

Answer

Just an example, where the verb décider is once used transitively with avoir and then in a reflexive construction with être.Il a décidé la question. -- He decided the question (the matter).Il s'est décidé. -- He made up his mind. ("He decided himself.")