Rano wsiadam do tramwaju, a moja siostra wysiada dwa przystanki później.

Rano by itself is a very common adverb meaning in the morning or in the morning hours.

So:

• Rano wsiadam do tramwaju = In the morning, I get on the tram

You do not normally say w rano.

Compare:

• rano = in the morning
• wieczorem = in the evening
• nocą = at night

If you want a fuller phrase, you can also say:

• wczesnym rankiem = early in the morning
• o poranku = at dawn / in the morning

But in everyday Polish, rano is the natural choice here.

In Polish, the present tense is often used for habitual or repeated actions, just like in English.

So:

• Rano wsiadam do tramwaju can mean I get on the tram in the morning / I usually get on the tram in the morning
• moja siostra wysiada dwa przystanki później = my sister gets off two stops later

This is a normal way to describe a routine.

The verbs here are imperfective:

• wsiadać = to be getting on / to get on habitually
• wysiadać = to be getting off / to get off habitually

If you wanted a one-time completed action in the past or future, you would use different forms.

These two verbs are a useful pair:

• wsiadać = to get in / get on
• wysiadać = to get out / get off

The prefix changes the direction:

• w- suggests movement into
• wy- suggests movement out of

So:

• wsiadam do tramwaju = I get on the tram
• wysiada z tramwaju = he/she gets off the tram

In your sentence, the second part omits z tramwaju because it is understood from context.

The verb wsiadać normally goes with do when talking about getting into a vehicle like a tram, bus, or car.

So the pattern is:

• wsiadać do + Genitive

Examples:

• wsiadać do tramwaju = to get on the tram
• wsiadać do autobusu = to get on the bus
• wsiadać do samochodu = to get into the car

This is just the standard government of the verb in Polish.

Because the preposition do requires the genitive case.

The dictionary form is:

• tramwaj = tram

After do, it becomes:

• do tramwaju

So:

• tramwaj → nominative singular
• tramwaju → genitive singular

This is a very common pattern in Polish. For example:

• do domu = to the house/home
• do szkoły = to school
• do sklepu = to the shop

Here a is a conjunction that often links two ideas with a mild contrast or comparison.

So in this sentence:

• Rano wsiadam do tramwaju, a moja siostra wysiada dwa przystanki później.

It is something like:

• I get on the tram in the morning, and my sister gets off two stops later
• or more literally in feeling: ..., while my sister gets off two stops later

It is not exactly the same as i.

A rough guide:

• i = and, simple addition
• a = and / while / whereas, with contrast or a shift of focus

Here a sounds natural because the sentence compares my action and my sister’s action.

Both are possible, but moja siostra is clearer and more natural if you want to say my sister explicitly.

Polish often drops things that are obvious from context, but possessives are still used when they matter.

So:

• moja siostra = my sister
• siostra = sister / the sister, depending on context

Also, the usual neutral order is:

• moja siostra

You can say siostra moja, but that sounds marked, poetic, or emphatic in many contexts.

Because Polish usually drops subject pronouns when the verb ending already shows who the subject is.

• wsiadam already means I get on
• the ending -am tells you it is I

So:

• (ja) wsiadam = I get on

Including ja is possible, but it adds emphasis:

• Ja wsiadam do tramwaju, a moja siostra... = I get on the tram, and my sister...

In normal neutral Polish, leaving out ja is more natural.

Because after the numeral dwa with a countable noun, Polish uses the nominative/accusative plural form.

Here:

• przystanek = stop
• dwa przystanki = two stops

In this sentence, the phrase functions adverbially, meaning two stops later.

Compare:

• jeden przystanek = one stop
• dwa przystanki = two stops
• trzy przystanki = three stops
• cztery przystanki = four stops
• pięć przystanków = five stops

So the form changes after different numbers:

• 2, 3, 4 → usually przystanki
• 5+ → usually przystanków

Później means later.

In this sentence:

• dwa przystanki później = two stops later

It tells you that your sister gets off after two more stops.

You can think of it as a time/order word, but in travel contexts it often refers to sequence along a route.

Examples:

• Spotkamy się później = We’ll meet later
• Wysiadam przystanek później = I get off one stop later
• Dwa przystanki później jest centrum = Two stops later is the city center

Yes, and it is very close in meaning, but the structure is a little different.

• dwa przystanki później = two stops later
• po dwóch przystankach = after two stops

Both can work in similar contexts.

For example:

• Moja siostra wysiada dwa przystanki później.
• Moja siostra wysiada po dwóch przystankach.

The first sounds a bit more like you are comparing her stop with some earlier point. The second sounds a bit more directly like counting the distance before she gets off.

Both are natural Polish.

Because Polish often leaves out words that are obvious from context.

If someone gets on a tram in the first part, then in the second part wysiada naturally means gets off the tram.

A fuller version would be:

• Rano wsiadam do tramwaju, a moja siostra wysiada z tramwaju dwa przystanki później.

But that sounds more repetitive. The shorter version is smoother and very natural.

Yes, but it depends on what you are getting onto.

A helpful rule is:

• do for things you get into
• na for things you get onto

Examples:

• do tramwaju = onto / into the tram
• do autobusu = onto / into the bus
• do samochodu = into the car

But:

• na rower = onto the bicycle
• na motocykl = onto the motorcycle
• na statek is also possible in many contexts

For tramwaj, do tramwaju is the normal form.

Not completely. Polish word order is fairly flexible, but different orders change the emphasis.

The original sentence is neutral and natural:

• Rano wsiadam do tramwaju, a moja siostra wysiada dwa przystanki później.

You could also say:

• Wsiadam rano do tramwaju, a moja siostra wysiada dwa przystanki później.
• Moja siostra wysiada później o dwa przystanki.
  This is less natural than the original, but understandable.

The original order is good because it presents the information clearly:

1. rano = when
2. wsiadam = action
3. do tramwaju = where/what vehicle
4. moja siostra = new subject
5. wysiada dwa przystanki później = what happens to her

So the sentence is not the only possible order, but it is a very standard one.