Learn Farsi: شاید آنها در استراحتگاه منتظر همدیگر می‌مانده باشند. - Maybe they are waiting for each other in the rest area.

The word shâyad (maybe) requires the subjunctive mood. However, because the action of waiting is ongoing right now ("are waiting"), we need the continuous subjunctive. This is formed by adding mi- to the past participle mânde, followed by the present subjunctive of "to be" (bâshand).

Why is the verb mândan (to stay) used here instead of budan (to be) for "waiting"?

In Farsi, "to wait" can be expressed as either montazer budan (to be waiting) or montazer mândan (literally "to stay waiting"). While both are common, using mândan emphasizes the active, ongoing duration of waiting for someone to arrive.

Is there a preposition missing before hamdigar (each other)? How do we say "waiting for"?

There is no preposition missing! The word montazer acts as an adjective meaning "expecting" or "awaiting." To connect it to the object you are waiting for, you simply use the ezafe (an invisible "e" sound). So, montazer-e hamdigar translates directly to "awaiting each other."

What does the suffix -gâh add to the word esterâhat?

The suffix -gâh means "place of." Since esterâhat means "rest," esterâhatgâh literally means "place of rest" or "rest area." You might recognize this same suffix from earlier vocabulary like (university, or place of knowledge) or (airport, or place of descent).