vous le connaissiez

you knew him/it

→ vous
phrase Rare #35,668
you knew him/it Imperfect tense. "Vous" can mean either formal singular or plural "you." The object pronoun "le" can refer to a person or thing, depending on context.
FR: Vous le connaissiez avant moi.
EN: You knew him before I did.

Vous le connaissiez?

Did you know him?

— Solaris (1972)

Vous le connaissiez bien?

Did you know him well?

Vous le connaissiez depuis longtemps?

Have you known him for a long time?

Je crois que vous le connaissiez.

I think you knew him.

— Oppenheimer (2023)

Comment se fait-il que vous le connaissiez si bien?

How is it that you know him so well?

Je pensais que vous le connaissiez.

I thought you knew him.

— Bacurau (2019)

Vous le connaissiez, n'est-ce pas?

You knew him, didn't you?