Kada ulazim u autobus, uvek gledam gde mogu da sedim.

Because this sentence describes a habitual action: something the speaker does regularly.

• Kada ulazim u autobus = When I get on / when I’m getting on the bus
• It uses the present tense because Serbian often uses the present for repeated, general situations.

If you said Kad sam ušao u autobus, that would refer to one completed past event: When I got on the bus.

So here, ulazim fits because the meaning is something like Whenever I get on a bus, I always...

Serbian and English do something similar here, but not always in exactly the same way.

In Serbian, the present tense is commonly used for:

• habits
• repeated actions
• general truths
• actions in subordinate time clauses like when

So Kada ulazim u autobus means When(ever) I get on the bus in a general sense, not necessarily right now.

This is not just about the present moment. It is more like:

• Whenever I board a bus
• When I get on a bus

Because after u you can have either:

• accusative for movement into
• locative for being in

Here we have movement:

• ulazim u autobus = I am entering the bus / getting onto the bus

So autobus is in the accusative singular, and for this noun the accusative looks the same as the nominative:

• nominative: autobus
• accusative: autobus

Compare:

• Ulazim u autobus. = I’m getting into/on the bus.
• Sedim u autobusu. = I’m sitting in the bus.

In the second example, autobusu is locative because it describes location, not motion.

This is a very common learner question. Serbian does not always match English prepositions literally.

With vehicles such as autobus, Serbian commonly uses:

• u autobus = onto/into the bus
• u autobusu = on/in the bus

Even though English prefers on the bus, Serbian uses u here. So it is best to learn it as the normal Serbian pattern rather than translate word-for-word.

Because Serbian usually does not need subject pronouns unless you want emphasis or contrast.

The verb ending already tells you the subject:

• ulazim = I enter / I am entering
• gledam = I look
• mogu = I can
• sedim = I sit / I am sitting

So ja is unnecessary here.

You could say Kada ja ulazim u autobus... but that would usually sound emphatic, like:

• When I get on the bus... as opposed to someone else

Literally, yes: gledam means I look / I watch. But in this sentence it has a slightly broader meaning.

Here uvek gledam gde mogu da sedim means something like:

• I always look to see where I can sit
• I always check where I can sit

So gledam is not just about physically using your eyes. It can also mean I check / I look for / I pay attention to depending on context.

Because the sentence is about place.

• gde = where
• šta = what
• kuda = which way / along what route

The speaker is looking for a place to sit, so gde is the correct question word:

• gde mogu da sedim = where I can sit

If you used kuda, it would suggest movement along a path, which does not fit here.

This is a standard Serbian structure.

After modal verbs such as:

• moći = can
• morati = must
• hteti = want

Serbian often uses:

• modal verb + da + present tense

So:

• mogu da sedim = I can sit

This is one of the most common sentence patterns in modern Serbian.

You may also see an infinitive sometimes in related languages or styles, but in standard everyday Serbian, mogu da sedim is completely normal.

Because sedeti and sesti/sednem are different in meaning and aspect.

• sedeti / sedim = to be sitting
• sesti / sednem = to sit down

In this sentence, the speaker is looking for a place where they can sit/be seated, not specifically the moment of sitting down.

So:

• gde mogu da sedim = where I can sit
• gde mogu da sednem = where I can sit down

Both can make sense depending on the situation, but sedim emphasizes being in a seat, while sednem emphasizes the act of taking a seat.

Yes, and it would be very natural too, but it changes the nuance a little.

• gde mogu da sedim = where I can sit / where I can be seated
• gde mogu da sednem = where I can sit down / where I can take a seat

If you are boarding a bus and looking for an available seat, many speakers might actually say gde mogu da sednem because the immediate action is sitting down.

But gde mogu da sedim is still understandable and natural, especially if the focus is on having a place to sit in general.

Because uvek is an adverb meaning always, and in Serbian adverbs like this often come before the verb they modify.

So:

• uvek gledam = I always look

That is the most neutral word order here.

Serbian word order is flexible, so other orders are possible for emphasis, for example:

• Kada ulazim u autobus, gledam uvek gde mogu da sedim.

But that sounds less neutral and more marked. The original version is the most natural everyday order.

Because the first part is a subordinate clause introduced by kada:

• Kada ulazim u autobus = when I get on the bus
• uvek gledam gde mogu da sedim = I always look where I can sit

In Serbian, it is standard to separate that introductory clause with a comma.

So the comma works much like in English:

• When I get on the bus, I always look...

Very little in meaning here.

• kada is the full form
• kad is a shorter form

Both mean when and both are very common. In everyday speech, kad is often more frequent because it is shorter and more conversational.

So you could also say:

• Kad ulazim u autobus, uvek gledam gde mogu da sedim.

That would sound perfectly natural.

Yes. This is mainly a pronunciation/spelling difference across standard varieties.

• gde is typical in Serbian Ekavian
• gdje is used in Ijekavian varieties

Likewise:

• uvek vs uvijek

So in Serbian you may see:

• Kada ulazim u autobus, uvek gledam gde mogu da sedim. or
• Kada ulazim u autobus, uvijek gledam gdje mogu da sjedim.

Both are valid depending on the variety, though the exact verb form may also vary a bit.

Yes, grammatically it could suggest the time period as I am getting on, but in normal context it is most naturally understood as a habitual whenever sentence.

Because of uvek and the present tense, the whole sentence strongly suggests repetition:

• Whenever I get on a bus, I always look where I can sit.

If you really wanted to emphasize while in the sense of an ongoing simultaneous action, Serbian might use different wording, such as dok in some contexts. But here kada is perfectly natural for a habitual when(ever) meaning.