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