habré usado
-I will have used
Future perfectyoconjugation ofusar.

usar

Uno está en medio del mar bajo una grúa de 30 m, tratando de bajar ocho toneladas al fondo del mar, y se pregunta por qué no habré usado acuarela de fondo.
When you're in the middle of the sea under a hundred-foot crane, trying to lower eight tons down to the sea floor, you start to wonder whether I shouldn't have taken up watercolor painting instead.
Word of the Day
to dive