Kada izlazim iz autobusa, moja sestra još stoji blizu vrata.

Yes. Kada means when and introduces a time clause.

In this sentence:

• Kada izlazim iz autobusa = When I am getting off the bus / When I get off the bus

Serbian often uses kada in the same kinds of situations where English uses when.

A shorter, very common alternative is kad. Both are correct:

• Kada izlazim iz autobusa...
• Kad izlazim iz autobusa...

Kad is more common in everyday speech, while kada can sound a bit more neutral or slightly more formal.

Serbian very often uses the present tense in subordinate clauses like this, especially to describe actions happening regularly, generally, or vividly in context.

• izlazim = I go out / I am going out / I get out, depending on context
• stoji = she stands / she is standing

So Kada izlazim iz autobusa, moja sestra još stoji blizu vrata can describe:

• a habitual situation: Whenever I get off the bus, my sister is still standing near the door
• a present scene, depending on context

Serbian does not need a special continuous form like English am getting off or is standing. The simple present often covers both meanings.

Because after iz (out of / from inside of), Serbian requires the genitive case.

So:

• autobus = nominative singular
• autobusa = genitive singular

That is why you get:

• iz autobusa = out of the bus

This is a very common pattern:

• iz kuće = out of the house
• iz škole = out of school
• iz sobe = out of the room

So here, iz automatically tells you that the following noun must change form.

Izlaziti literally means to go out / exit, and it works naturally with vehicles like buses when you mean to get out.

• izlazim iz autobusa = I’m getting out of the bus / I’m getting off the bus

You may also hear silaziti in some contexts, especially with the idea of getting down/off, but izlaziti iz autobusa is completely normal and very common.

A useful pattern is:

• ulazim u autobus = I get into the bus
• izlazim iz autobusa = I get out of the bus

So the pair u / iz and ulaziti / izlaziti is very helpful to learn together.

Izlazim is the 1st person singular present of izlaziti, which is an imperfective verb.

That means it is used for:

• ongoing actions
• repeated actions
• habitual situations
• general statements

Its perfective partner is usually izaći:

• izlaziti = to be going out / to go out regularly
• izaći = to go out once, to exit, to come out completely

So compare:

• Kada izlazim iz autobusa... = when I am getting off / when I get off regularly
• Kada izađem iz autobusa... = when I get off / once I get off

The perfective version would sound more like a single completed event.

Both are possible, but moja sestra explicitly means my sister.

• sestra = sister
• moja sestra = my sister

Serbian often includes possessive adjectives like moj, tvoj, njegov, njen when it wants to be clear or slightly more specific.

Here:

• moja agrees with sestra in gender, number, and case.
• sestra is feminine singular nominative, so the possessive is also feminine singular nominative: moja

You could say just sestra if the context already makes it obvious whose sister you mean, but moja sestra is perfectly natural.

Here još means still.

So:

• moja sestra još stoji blizu vrata = my sister is still standing near the door

Depending on context, još can also mean:

• more / another
• yet
• in addition

But in this sentence, the meaning is clearly still.

Examples:

• Još čekam. = I’m still waiting.
• Hoćeš još kafe? = Do you want more coffee?
• Još nisam završio. = I haven’t finished yet.

Because Serbian does not form the present continuous the way English does.

In English, you say:

• she stands
• she is standing

In Serbian, both are often expressed with the simple present:

• stoji

So stoji can mean:

• she stands
• she is standing

The exact meaning depends on context.

This is very common in Serbian:

• sedi = sits / is sitting
• leži = lies / is lying
• čeka = waits / is waiting

So there is no need for an extra verb equivalent to English is in this sentence.

Blizu usually takes the genitive case, so vrata here is genitive.

The noun vrata is a special noun in Serbian because it is plural in form and usually means door as a whole.

So:

• vrata = door
• after blizu, the form is also vrata

That can look confusing because the form does not change here, but the case function does.

So:

• blizu vrata = near the door

Other examples with blizu:

• blizu kuće = near the house
• blizu škole = near the school
• blizu prozora = near the window

The sentence has a very natural Serbian word order:

• Kada izlazim iz autobusa, moja sestra još stoji blizu vrata.

Literally:

• When I get off the bus, my sister still stands near the door.

This order is neutral and clear:

1. time clause first
2. main clause second

Serbian word order is fairly flexible, so some rearrangement is possible for emphasis. For example:

• Moja sestra još stoji blizu vrata kada izlazim iz autobusa.

This is also understandable, but the original version sounds more natural as a basic statement.

Within the main clause, moving još can slightly change emphasis, but the given sentence is the most straightforward form.

Yes, and the meaning would shift slightly.

• Kada izlazim iz autobusa... uses the imperfective verb and suggests an ongoing or repeated situation.
• Kad izađem iz autobusa... uses the perfective verb and suggests a completed action: when I have gotten off / once I get off

So compare:

• Kada izlazim iz autobusa, moja sestra još stoji blizu vrata.

  • more like when I’m getting off the bus / when I get off the bus (habitually)

• Kad izađem iz autobusa, moja sestra još stoji blizu vrata.

  • more like when I get off the bus / once I get off the bus

Both can be correct, but they are not exactly the same in aspect.

It is singular.

The base noun is:

• autobus = bus

After iz, it becomes genitive singular:

• autobusa = of the bus / from the bus

So:

• iz autobusa = out of the bus

If it were plural, you would expect something like:

• iz autobusa / iz autobusa only in some forms may look similar in other nouns, but for autobus, context usually makes number clear

In this sentence, it clearly means one bus.

Here are the main dictionary forms:

• kada = when
• izlazim → izlaziti = to go out, to get out
• iz = out of, from
• autobusa → autobus = bus
• moja → moj = my
• sestra = sister
• još = still / more / yet
• stoji → stajati = to stand
• blizu = near
• vrata = door

This is a useful habit in Serbian: when you see a changed form like autobusa or moja, try to connect it back to its dictionary form autobus or moj.