آنها در ایستگاه منتظر ما هستند.

A word-by-word breakdown is:

• آنها = they
• در = in / at
• ایستگاه = station
• منتظر = waiting
• ما = us
• هستند = are

So the structure is literally something like:

• They at the station waiting us are

Natural English: They are waiting for us at the station.

In Persian, منتظر is very commonly used with a form of بودن (to be) to express to be waiting.

So:

• منتظر هستم = I am waiting
• منتظر هستی = you are waiting
• منتظر هستند = they are waiting

This is different from English, where wait is a regular verb by itself. In Persian, this idea is often expressed more like to be in a waiting state.

So منتظر ما هستند is literally closer to:

• They are waiting for us
• or more literally, They are in a waiting state for us

Because Persian and English do not always use the same prepositions.

In English, we say:

• wait for someone

In Persian, with منتظر, you usually just put the person directly after it:

• منتظر ما = waiting for us
• منتظر تو = waiting for you
• منتظر دوستانم = waiting for my friends

So even though English needs for, Persian does not here.

Persian usually puts the verb at the end of the sentence.

That is one of the most important word-order differences from English.

So:

• آنها = subject
• در ایستگاه = location
• منتظر ما = waiting for us
• هستند = are

The final هستند is normal Persian sentence order.

هستند is the third-person plural form of بودن (to be).

It matches آنها (they).

Here are some present-tense forms:

• هستم = I am
• هستی = you are (singular, informal)
• است / هست = he/she/it is
• هستیم = we are
• هستید = you are (plural or formal)
• هستند = they are

So منتظر ما هستند means they are waiting for us.

Often, it can be left out.

Because هستند already shows that the subject is they, Persian can say:

• در ایستگاه منتظر ما هستند

This still means They are waiting for us at the station.

Including آنها makes the subject more explicit, and it may add a little emphasis or clarity.

That order is very natural in Persian, but Persian word order is somewhat flexible.

This sentence puts the location before the waiting phrase:

• آنها در ایستگاه منتظر ما هستند
• They are at the station waiting for us

You may also hear slightly different arrangements depending on emphasis, but the given order is standard and natural.

The key rule is that the verb usually stays at the end.

A common transliteration is:

• ânhâ dar istgâh montazer-e mâ hastand

A natural pronunciation guide might be:

• aan-HAA dar ees-tgaaH مون-ta-ze-re maa has-tand

A few notes:

• آنها sounds like ânhâ
• ایستگاه is often pronounced roughly istgâh
• منتظر is montazer
• In connected speech, منتظر ما is often heard with an ezafe-like link: montazer-e mâ

That is a more colloquial spoken version.

Compare:

• Written / more formal: آنها در ایستگاه منتظر ما هستند
• Spoken / everyday: اونا توی ایستگاه منتظر ما هستن

Differences:

• آنها → اونا = they
• در → توی = in / at
• هستند → هستن = spoken are

Both mean the same thing. The version you were given is more standard written Persian.

No. ایستگاه is a general word for station.

Depending on context, it can mean:

• bus station
• train station
• subway/metro station
• a stop or station in other systems

If the type of station needs to be clear, Persian often adds another word:

• ایستگاه قطار = train station
• ایستگاه اتوبوس = bus station
• ایستگاه مترو = metro station

By itself, ایستگاه just means station.

Because ما here is not a direct object in the usual sense.

را marks definite direct objects, but in منتظر ما هستند, the phrase منتظر ما works as a complement of منتظر, not as a normal direct object of a verb.

So:

• آنها ما را می‌بینند = They see us
  Here ما را is a direct object.

But:

• آنها منتظر ما هستند = They are waiting for us
  No را is used.

That is just how منتظر works.

Yes, depending on context.

Because ایستگاه can refer to different kinds of stations or stops, the exact English translation can vary:

• They are waiting for us at the station
• They are waiting for us at the stop

If the broader context is buses, then stop may be a better translation. If it is trains or metro, station is more natural.

Yes. This sentence is grammatically standard and neutral-to-formal.

What makes it feel more written or careful is mainly:

• آنها instead of spoken اونا
• در instead of spoken توی
• هستند instead of spoken هستن

So this is a very good model sentence for learning standard Persian, even though everyday conversation may use a more relaxed version.