Voy a comprar pan. - No tardes. El almuerzo estará listo en diez minutos.I'm going to buy some bread. - Don't be long. Lunch will be ready in ten minutes.
Nos vemos a las seis en la puerta del cine. No tardes o entraré sin ti.Meet me at six o'clock outside the movie theater. Don't be late or I'll go in without you.