would know
How would she know?
Tout le monde saurait qu'on lui a piqué sa planche.
Everyone would know that someone had stolen their board.
— Apocalypse Now (1979)
Arrête, on saurait pas qui est le père !
Stop, we wouldn’t know who the father is!
— Get Out Your Handkerchiefs (1978)
Vous seriez celle qui le saurait.
You would be the one who would know.
Une fille comme toi ne saurait jamais ce que c'est, l'amitié.
A girl like you could never know what friendship is.
— Old Boy (2003)
Peut-être le saurait-on si le haut était intact.
Perhaps we would know if the top were intact.
— Indiana Jones et la dernière croisade (1989)
Vous seriez celui qui le saurait.
You would be the one who would know.