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:
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
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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