вы спали

you slept

→ вы
phrase Uncommon #13,918
you slept Вы can address one person formally or more than one person. In the past tense, спали is used with вы regardless of gender.
RU: Вы спали хорошо?
EN: Did you sleep well?

Вы спали.

You were sleeping.

Мы сделали это, пока вы спали.

We did this while you were sleeping.

Том заходил, пока вы спали.

Tom came in while you were sleeping.

Вы спали в самолёте?

Did you sleep on the plane?

Вы спали, да?

You were sleeping, right?

Вы спали в одежде?

Did you sleep with your clothes on?

Вы спали отдельно?

Did you sleep separately?

— Анатомия падения (2023)