a good reason
Yo tuve una buena razón para hacerlo.
I had a good reason for doing it.
Para matar a un capo de la mafia necesitabas una buena razón.
To kill a mafia boss, you needed a good reason.
— Uno de los nuestros (1990)
Mary debe haber tenido una buena razón para lo que hizo.
Mary must have had a good reason for what she did.
Dame una buena razón para no hacerlo.
Give me one good reason why not.
Tom tenía una buena razón para enojarse.
Tom had a good reason to be angry.
There is a good reason.
Es una buena razón para no perder demasiado tiempo.
That’s a good reason not to waste too much time.
Tom tuvo una buena razón.
Tom had a good reason.
I did it for a good reason.