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с ними знакомы

are acquainted with them

→ с
phrase Rare #44,577
are acquainted with them The phrase can also mean “were acquainted with them” in a past-tense sentence.
RU: Как давно вы с ними знакомы?
EN: How long have you known them?

Вы ведь были с ними знакомы?

You knew them, didn’t you?

Как давно вы с ними знакомы?

How long have you known them?

Я думал, мы с ними знакомы.

I thought we knew each other.

Вы ведь не были с ними знакомы?

You didn’t know them, did you?

Вы ведь с ними знакомы?

You know them, don't you?