A la hora de elegir una computadora, es importante tener en cuenta qué uso le vas a dar.When it comes to choosing a computer, it's impotant to keep in mind what you're going to use it for.
A Pepe le encantaba la juerga, pero a la hora de trabajar, arrimaba el hombro como el que más.Pepe loved partying, but when it came to working, he mucked in as much as anyone else.
Iré al banco a la hora de comer, antes de ir al restaurante.I'll go to the bank at lunchtime, before going to the restaurant.
Luis se portó mal, y la profesora lo castigó a quedarse en clase a la hora del recreo.Luis behaved badly, and the teacher made him stay in the classroom at playtime.