tu te serais

you would have

→ tu
phrase Very common #1,648
you would have Used with a past participle in a hypothetical or conditional sentence; te is part of a reflexive construction.
FR: Tu te serais endormi si tu étais resté sur le canapé.
EN: You would have fallen asleep if you had stayed on the couch.

Je pensais que tu te serais perdue.

I thought you would have gotten lost.

Tu te serais déguisé en femme.

You would have dressed up as a woman.

— Laurence Anyways (2012)

Au cas où tu te serais senti gêné.

In case you felt embarrassed.

— L'Ultime Héritier (2026)

Tu te serais foutu de la gueule de Mathilde comme ça, toi ?

Would you have made fun of Mathilde like that?

— Caché (2005)