You have to put the auxiliary before the verb it can be « sommes montés » or « avons montés », it depends of the context.
Answer:
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Bonjour,
Les livres ? Nous ne <u>les</u> avons pas encore _lus. ____
accord: COD placé avant "avoir"
Answer:
Mon grand-pere n'ai pas beaucoup d'argent.
Explanation:
'My grandfather doesn't have a lot of money' You put the 'ai' because it is the conjugated verb of avoir (to have)
