was necessary
Lo habría hecho si hubiese sabido que era necesario.
I would have done it if I had known it was necessary.
No era necesario que te dieras prisa.
You didn't need to hurry.
That was not necessary.
Les dije que no era necesario que esté nadie esperando en la puerta.
I told them that it wasn't necessary for anyone to be waiting at the door.
Sabía que ya no era necesario.
I knew it was no longer necessary.
Este comentario no era necesario.
This comment was not necessary.
No era necesario que trajera un paraguas.
I didn't need to bring an umbrella.
Era necesario estudiar el asunto a fondo.
It was necessary to study the matter thoroughly.
No era necesario que mantuviera el silencio.
It wasn't necessary for me to keep quiet.