I don't think so
No creo ser el único que lo notó.
I don't think I'm the only one who noticed.
Estando en la computadora por tanto tiempo, no creo poder dormir.
After being on the computer for so long, I don't think I'll be able to sleep.
No creo lo que acabas de decir.
I can't believe what you just said.
Creía en muchas cosas que ya no creo.
I used to believe in many things that I no longer believe in.
— El laberinto del fauno (2006)