habré usado
-I will have used
Future perfect yo conjugation of usar.

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.
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to sparkle