Dile a Pedro que, si le interesa, tendrá que darse prisa en comprar entradas, porque se agotarán pronto.Tell Pedro that, if he's interested, he'll have to hurry up to buy ticktes, because they'll sell out quickly.
Carmela dice que le interesa, pero que, ahora mismo, no tiene tiempo para nuevos proyectos.Carmela says that she's interested, but that right now, she doesn't have time for new projects.
Carlos sabe mucho de filosofía. Creo que le interesa porque le ayuda a vivir.Carlos knows a lot about philosophy. I think he's interested in it because it helps him to live.
Ana está leyendo un libro sobre la historia de Rusia. - Sí, le interesa mucho.Ana is reading a book on Russian history. - Yes, she's very interested in it.
¿Rosa va a ir a la manifestación? - Sí, por supuesto; le interesa mucho la política.Is Rosa going on the demonstration? - Yes, of course. She's very interested in politics.