бе

Мо бе шумо омадем.
We came without you.
Сангпуштон бе обу хӯрок то чордаҳ моҳ зиндагӣ карда метавонанд.
Tortoises can live fourteen months without food and water.

Bonus:
Antonym: бо (without)

Бе is also used as a prefix. Here are some examples –
беабр: cloudless
беадаб: impolite
беадолат: unrighteous
бекор: unemployed
буқувват: weak
бешакл: shapeless