Kada idem u kancelariju, skrećem levo kod banke.

Because Serbian uses conjugated verb forms in normal sentences, just like English uses I go rather than to go.

• idem = I go / I am going
• skrećem = I turn / I am turning

The infinitives are:

• ići = to go
• skretati = to be turning / to turn (imperfective)

So in this sentence, the speaker is saying what they do, not just naming the action.

In Serbian, the present tense is often used for habitual actions or things that happen regularly.

So Kada idem u kancelariju, skrećem levo kod banke means something like:

• When I go to the office, I turn left at the bank
• Whenever I’m going to the office, I turn left at the bank

This is very natural in Serbian. The present tense here does not have to mean only right now.

Yes. kada and kad both mean when.

• kada is a bit more full/formal/neutral
• kad is very common in everyday speech

So both are possible:

• Kada idem u kancelariju, skrećem levo kod banke.
• Kad idem u kancelariju, skrećem levo kod banke.

Both are correct.

Because u can take different cases depending on whether there is movement toward a place or location in a place.

Here, idem u kancelariju means I am going into/to the office, so it shows direction/motion toward a destination. That requires the accusative:

• kancelarija → kancelariju (accusative singular)

Compare:

• Idem u kancelariju. = I’m going to the office. → motion, accusative
• Radim u kancelariji. = I work in the office. → location, locative

This is a very important Serbian pattern.

banke is in the genitive singular.

That is because the preposition kod normally takes the genitive.

• kod banke = by the bank / near the bank / at the bank

So:

• banka = nominative
• banke = genitive singular

Other examples with kod:

• kod škole = by the school
• kod kuće = at home
• kod doktora = at the doctor’s place / at the doctor

No, they are different.

• kod banke = by the bank / near the bank
• u banci = in the bank

In your sentence, kod banke means the bank is a landmark on the route. The speaker turns left at the point where the bank is.

So if you are giving directions, kod banke is very natural.

levo is the normal adverb meaning to the left / left.

In Serbian, directions like this are often expressed with adverbs:

• levo = left
• desno = right
• pravo = straight

So:

• skrećem levo = I turn left
• skrećem desno = I turn right

This is the standard way to say it.

Serbian often omits subject pronouns when they are clear from the verb ending.

• idem already tells you I go
• skrećem already tells you I turn

So ja is unnecessary unless you want to add emphasis or contrast.

Compare:

• Idem u kancelariju. = I’m going to the office.
• Ja idem u kancelariju, a on ide kući. = I’m going to the office, and he’s going home.

In the second example, ja is used for emphasis or contrast.

Because Kada idem u kancelariju is a subordinate clause meaning when I go to the office.

In Serbian, as in English, a clause like that is typically separated by a comma when it comes first:

• Kada idem u kancelariju, skrećem levo kod banke.

If the main clause comes first, a comma is also commonly used:

• Skrećem levo kod banke kada idem u kancelariju.

The version with the kada-clause first sounds especially natural when explaining a routine or route.

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

• skretati / skrećem = imperfective
• skrenuti / skrenem = perfective

In this sentence, the speaker is talking about a repeated/habitual action, so the imperfective verb is the natural choice:

• Kada idem u kancelariju, skrećem levo kod banke.

Using skrenem would sound more like a completed single action in a different kind of context. For habitual directions, skrećem is better.

The given word order is natural, but Serbian word order is fairly flexible.

Standard version:

• Kada idem u kancelariju, skrećem levo kod banke.

You could also hear:

• Kad idem u kancelariju, kod banke skrećem levo.

That version puts more focus on kod banke as the turning point.

Even though Serbian allows flexibility, learners should usually start with the more neutral order:

• time clause first → main clause second

That is clear and idiomatic.

No, but it is a very common one.

• kancelarija = office, especially the room/office space
• ured can also mean office, but usage depends on region and context

In many everyday situations, kancelarija is perfectly natural and widely understood.

So for this sentence, u kancelariju is completely normal.