he couldn't
Él no pudo adaptarse a nuevas circunstancias.
He couldn't adapt to new circumstances.
Él no pudo contener su cólera ni un segundo más.
He could not contain his anger for even a second longer.
Él no pudo ir a la universidad.
He couldn't go to university.
He couldn't calm down and sleep.
Él no pudo cumplir con nuestras expectativas.
He was unable to meet our expectations.
Él no pudo expresar lo que sentía.
He couldn't express what he felt.
Él no pudo hacer nada más que entregar sus planes contra su voluntad.
He could do nothing but surrender his plans against his will.
Tomando todo en consideración, él no pudo ser el criminal.
Taking everything into consideration, he couldn't have been the criminal.
He couldn't open the box.