I can't seem to
Este dolor de cabeza no se me va.
This headache won't go away.
Quizás no se me den los caballos, pero nací para hacer esto.
Maybe I'm not good with horses, but I was born to do this.
— Avatar (2009)
I haven't lost it.
Hace tres días que tengo dolor de cabeza y no se me va.
I've had a headache for three days, and it won't go away.
No te preocupes, no se me va a ir sin una lucha.
Don't worry, I'm not going to leave without a fight.
— Atrápame si puedes (2002)
No se me pudo ocurrir cómo hacerlo.
I couldn't think of how to do it.