yo habré utilizado su cepillo

Cuando Juanjo vuelva, yo habré utilizado su cepillo, y él no tiene por qué enterarse.
When Juanjo comes back, I'll have used his brush, and there's no reason why he should find out.
Para cuando usted acabe de ducharse, yo habré utilizado su cepillo y no lo necesitaré más; siempre que me lo preste, claro.
By the time you're done showering, I'll have used your brush, and won't need it anymore; as long as you lend it to me, of course.
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