In Passé composé, some verbs have very short irregular past participles (vu, bu, cru, su, lu, tu, pu, dû).
Look at these sentences in Passé composé:
As-tu vu l'éléphant rose?Did you see the pink elephant?
Je ne l'ai jamais cru.I never believed him.
Nous avons lu ce livre hier.We read that book yesterday.
Elle n'a jamais su la vérité.She never knew the truth.
Il a tu les raisons de son départ.He kept quiet the reasons of his departure.
Ils ont bu toute la soirée.They drank all night.
Vous avez pu rencontrer Sting.You were able to meet Sting.
You could meet Sting.
J'ai dû annuler mon vol.I had to cancel my flight.
Note that they all work with avoir as an auxiliary.
It's worth learning this list by heart since these verbs all have the same sounding short past participle:
voir (to see) -> vu
boire (to drink) -> bu
croire (to believe) -> cru
savoir (to know) -> su
lire (to read) -> lu
taire (to silence, to keep quiet) -> tu [rare]
pouvoir (to be able to) -> pu
devoir (to have to) -> dû
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