quem lhe ensinou a

who taught you to

→ quem
phrase Rare #37,517
who taught you to Used to ask who taught someone a skill or action. The pronoun lhe is often formal here and can mean you.
PO: Quem lhe ensinou a nadar?
EN: Who taught you to swim?

Quem lhe ensinou a fazer isso?

Who taught you to do that?

Quem lhe ensinou a patinar?

Who taught you how to skate?

Quem lhe ensinou a falar Francês?

Who taught you to speak French?

Quem lhe ensinou a tocar piano?

Who taught you to play the piano?

Quem lhe ensinou a falar francês?

Who taught you to speak French?