за нами следят

we are being watched

→ за
phrase Rare #36,630
we are being watched Literally, “they are following us”; the unspecified subject can refer to people monitoring or following us. The form следят is present tense; следили in the fourth example is past tense.
RU: Мне кажется, за нами следят.
EN: I think we are being watched.

Звучит нелепо, но я думаю, за нами следят.

It sounds ridiculous, but I think we're being watched.

— Прокол (1981)

Не понимаю, с чего вы взяли, что за нами следят.

I don't understand why you think we're being followed.

— Прокол (1981)

Кажется, за нами следят.

It seems like we're being followed.

За нами следят.

We are being watched.

— Не говори никому (2006)