Questions & Answers about Можно присоединиться к нам.
Можно means it is possible / it is allowed / one may. In this sentence, it works like May I...?/Is it okay to...? depending on context.
Russian often leaves the person unstated, so Можно присоединиться к нам literally feels like Is it possible to join us? but in real use it often means May I join you?
Russian often omits the subject when it is understood from context.
So Можно присоединиться к нам does not literally contain I, but the speaker is usually talking about themselves:
- Можно присоединиться к вам? = May I join you?
- Можно присоединиться к нам? can also be used in context where the meaning is understood as Can someone join us? or Is it possible to join us?
The exact English subject often has to be supplied from the situation.