What is the French phrase which means to have done something before?

The French phrase for "to have done something before" is "avoir déjà fait quelque chose".

Here's a breakdown:

* Avoir: To have

* Déjà: Already

* Faire: To do

* Quelque chose: Something

Example:

"J'ai déjà fait du ski." - I have already skied.

This phrase can be used in many contexts, from describing past experiences to indicating familiarity with a task.