Here's how it works:
* Auxiliary verb: "avoir" (to have) in the present tense, conjugated according to the subject pronoun.
* Past participle: "vu" (seen)
Here are the full conjugations:
* j'ai vu (I have seen)
* tu as vu (you have seen)
* il/elle/on a vu (he/she/one has seen)
* nous avons vu (we have seen)
* vous avez vu (you have seen)
* ils/elles ont vu (they have seen)