was very difficult
The problem was very difficult.
Aprobaron todos los exámenes menos el de física que era muy difícil.
They passed all the exams except for the physics one, which was very difficult.
Traté de seguir el buen camino, pero era muy difícil.
I tried to do the right thing, but it was very difficult.
— El bueno, el feo y el malo (1966)
It was very difficult.
El examen que hizo la semana pasada era muy difícil.
The exam he took last week was very difficult.
El examen de esta asignatura era muy difícil.
The exam for this subject was very difficult.
The work was very difficult.
Era muy difícil nadar contra la corriente.
It was very difficult to swim against the current.
The exam was very difficult.