it was necessary
Il a fallu trois jours pour peindre toute la maison.
It took three days to paint the whole house.
Il a fallu du temps pour que les choses reviennent à la normale.
It took a while for things to get back to normal.
Il a fallu amputer la jambe de Sami.
Sami’s leg had to be amputated.
Y avait trop de volontaires, il a fallu se battre "Smokey" Joe Wood !
There were too many volunteers, so we had to fight for Smokey Joe Wood!
— Jusqu'au bout du rêve (1989)
It took a lot of guts.
Il a fallu que Chikako me quitte pour que je réalise à quel point je l'aimais.
It took Chikako leaving me for me to realize how much I loved her.