i don't know why
I don't know why I did it.
No sé por qué me molesto en venir aquí.
I don’t know why I bother coming here.
No sé por qué Tom no vino y no quiero preguntarle.
I don't know why Tom didn't come, and I don't want to ask him.
No sé por qué necesitamos hacerlo.
I don't know why we need to do it.
Simplemente no sé por qué Tom no quiere que le ayude.
I simply don't know why Tom doesn't want me to help him.
No sé por qué despidieron a Tom.
I don't know why Tom was fired.
No sé por qué estoy siempre tan cansada.
I don't know why I'm always so tired.
I don't know why it happened.
I don't know why it's happening.
No sé por qué no lo dijiste desde el inicio.
I don't know why you didn't say so from the beginning.
— Eternity (2025)
No sé por qué lo he hecho, ese tipo no era nada.
I don't know why I did it, that guy was nothing.
— La vida de Adèle (2013)
No sé por qué Frank no estaba allí.
I don't know why Frank wasn't there.
— Hasta que llegó su hora (1968)
Nada, no sé por qué lo he dicho.
Nothing, I don't know why I said it.
— Astérix y Obélix: Misión Cleopatra (2002)