a good reason
That's a good reason.
Dame una buena razón para no hacerlo.
Give me one good reason why not.
Dime una buena razón por la que no debería quedarme otra semana más.
Give me one good reason why I shouldn't stay another week.
Mary debe haber tenido una buena razón para lo que hizo.
Mary must have had a good reason for what she did.
I did it for a good reason.
Es una buena razón para no perder demasiado tiempo.
That’s a good reason not to waste too much time.
Yo tuve una buena razón para hacerlo.
I had a good reason for doing it.
There is a good reason.
This isn't a good reason.
Sabía que había una buena razón.
I knew there was a good reason.