did you know
De quelle manière le saviez-vous ?
How did you know?
Did you already know that?
Et d'où le saviez-vous qu'ils y étaient ?
And how did you know they were there?
— Le Bras de diamant (1969)
Did you know that at the time?
Saviez-vous qu'il y avait plus d'une façon de faire ça ?
Did you know there was more than one way to do that?
Ne saviez-vous pas qu'il est mort il y a deux ans ?
Didn't you know that he died two years ago?