I've already...
Je l'ai déjà entendue, celle-là.
I've heard that one before.
Ne vous en faites pas, je l'ai déjà réparé.
Don't worry, I've already fixed it.
I've seen it before.
Je l'ai déjà donné à Tom.
I already gave it to Tom.
I've already paid for it.
I've already done it.
I've heard it before.