Kada izlaziš iz autobusa, uzmi svoju torbu.

Kada means when. It introduces a time clause:

• Kada izlaziš iz autobusa = When you get out of the bus / When you are getting out of the bus

In Serbian, kada is a very common way to say when in sentences about time.

Izlaziš is the 2nd person singular present tense form of izlaziti / izaći (to go out, to exit).

It matches you:

• ja izlazim = I go out / I am going out
• ti izlaziš = you go out / you are going out

So kada izlaziš literally means when you are exiting or when you exit.

This is very normal in Serbian. After words like kada (when), Serbian often uses the present tense to talk about a future situation.

So:

• Kada izlaziš iz autobusa, uzmi svoju torbu.

can refer to something that will happen later, even though izlaziš is present tense.

English often does something similar:

• When you get off the bus, take your bag.

That is present in form, but future in meaning.

This is about aspect, which is very important in Serbian.

• izlaziti = imperfective: focuses on the process, repetition, or general action
• izaći = perfective: focuses on a completed action

In your sentence, izlaziš comes from the imperfective verb izlaziti. In a kada clause, this can sound natural because it refers to the action as the situation in which something else should happen.

A closely related version is:

• Kada izađeš iz autobusa, uzmi svoju torbu.

This version uses the perfective verb and often feels more like:

• When you have gotten off the bus / Once you get off the bus, take your bag.

Both can be understandable, but the perfective version is often especially natural when the first action must be completed before the second one happens.

Because the preposition iz (out of, from inside) requires the genitive case.

So:

• autobus = nominative
• autobusa = genitive

That is why you get:

• iz autobusa = out of the bus

This is a standard rule:

• iz + genitive

Usually, iz is used when you are coming out of the inside of something:

• iz autobusa = out of the bus

Sa usually means from off of a surface or place:

• sa stola = from the table
• sa zida = from the wall

For a bus, Serbian normally treats it as something you are inside, so iz autobusa is the expected choice.

Uzmi is the imperative form of the verb uzeti (to take).

Since the speaker is giving an instruction or command, Serbian uses the imperative:

• uzmi! = take!

Compare:

• uzimaš = you take / you are taking → statement, not command
• uzeti = infinitive-like dictionary form
• uzmi = command

So:

• uzmi svoju torbu = take your bag

Again, this is aspect.

• uzeti = perfective = take something as a completed action
• uzimati = imperfective = be taking / take repeatedly / be in the process of taking

In commands, Serbian often uses the perfective imperative when the speaker wants one complete action:

• Uzmi svoju torbu. = Take your bag.

This means: do it once, successfully, and complete the action.

If you used an imperfective command, it would usually have a different feel, such as repeated action, process, or a different nuance.

Svoj is the reflexive possessive adjective. It means something like one’s own.

Serbian prefers svoj when the possessor is the same as the subject of the clause.

Here, the implied subject of uzmi is you, and the bag also belongs to you, so:

• uzmi svoju torbu = take your own bag

This is more natural than uzmi tvoju torbu in this kind of sentence.

Very roughly:

• svoju = your own
• tvoju = your, but often used when contrast or emphasis is intended

Yes. Svoju is a form of svoj that agrees with torbu.

Since torbu is:

• feminine
• singular
• accusative

the possessive adjective must match it:

• svoja torba (dictionary-type nominative phrase)
• svoju torbu (accusative, as the direct object)

So svoju is just the correct case/gender/number form to go with torbu.

Because torba is the direct object of the verb uzmi.

The verb uzeti (to take) takes a direct object, and feminine singular nouns like torba usually change to -u in the accusative:

• torba = nominative
• torbu = accusative

So:

• Uzmi torbu. = Take the bag.

The comma separates the time clause from the main clause:

• Kada izlaziš iz autobusa, = subordinate clause
• uzmi svoju torbu. = main clause

This is similar to English:

• When you get off the bus, take your bag.

So the comma is there because the sentence begins with a dependent clause.

Yes, Serbian word order is fairly flexible, though some versions sound more natural than others.

For example, you could also say:

• Uzmi svoju torbu kada izlaziš iz autobusa.

This still means the same thing. But the original version puts the time condition first, which is very natural for instructions.

Also, Serbian often uses word order to shift focus or emphasis, not just grammar.

It is informal singular, because the verbs are addressed to ti (you, one person informally):

• izlaziš
• uzmi

If you wanted the formal or plural version, you would say:

• Kada izlazite iz autobusa, uzmite svoju torbu.

That can mean:

• speaking politely to one person, or
• speaking to more than one person

Yes. Kad is a shorter, very common variant of kada.

So you can say:

• Kad izlaziš iz autobusa, uzmi svoju torbu.

This is very natural in everyday speech.

Very roughly:

• kada = a bit fuller, sometimes slightly more formal or careful
• kad = very common in normal conversation

Both are correct.