yang bisa tolong ya soal nya besok sudah dikumpulin

we (know) each other since we were nine or ten
(+) We know each other since we are nine or ten
(-) We don't know each other since we are nine or ten
(?) Do we know each other since we are nine or ten ?

Maaf ya kalo salah :)

+ We have known each other since we were nine or ten
- we havent know each other since we were nine or ten
? Have we know each other since we were nine or ten