Iznajmi kombi da bismo preneli fotelju.

Iznajmi is the 2nd person singular imperative of iznajmiti.

So it means you are telling one person: Rent ...

A few useful comparisons:

• iznajmiti = perfective, to rent / to hire as one completed action
• iznajmi! = rent! (to one person)
• iznajmite! = rent! (to more than one person, or polite singular)

The perfective verb is natural here because the speaker means do this one concrete action.

In this sentence, iznajmi is best understood as rent.

With kombi, the idea is rent a van for temporary use.

English may sometimes use hire in some varieties, but rent is the clearest choice for most learners.

Kombi means a van, often one used for:

• carrying people
• carrying cargo
• moving large items

Here it clearly means a van suitable for transporting furniture.

It is not a full truck; for that Serbian would more likely use kamion.

Serbian very often uses a da-clause where English uses an infinitive.

So instead of something structured like:

• Rent a van to carry the armchair

Serbian naturally says something like:

• Rent a van so that we can/would carry the armchair

That is why you get da bismo preneli.

This is a very common pattern in Serbian, so English speakers often need time to get used to it.

Bismo is the 1st person plural conditional auxiliary of biti.

In simpler terms, it is the form used with we in conditional-type constructions:

• ja bih
• ti bi
• on/ona bi
• mi bismo
• vi biste
• oni bi

In this sentence, da bismo introduces a purpose clause:

• da bismo preneli fotelju = so that we could / so that we would be able to carry the armchair

So even though the literal structure looks a bit different from English, the function is very natural in Serbian.

By itself, preneli is the past active participle form of the verb preneti.

But here it is not functioning as a simple past tense. Together with bismo, it forms a conditional construction:

• bismo preneli = we would carry / move
• in this sentence, after da, it expresses purpose: so that we could carry / move

So you should read da bismo preneli as one unit.

Because the participle agrees with the implied subject we.

In Serbian, the participle in this construction shows gender/number:

• bismo preneli = if the group is masculine or mixed, or if gender is not being made explicit
• bismo prenele = if the group is all female

So the sentence assumes an implied mi and uses the common default masculine plural form.

Yes, absolutely.

Iznajmi kombi da prenesemo fotelju is also natural Serbian.

The difference is mostly one of nuance:

• da prenesemo = simpler, very common, conversational
• da bismo preneli = a bit more explicit about purpose, sometimes slightly more formal or more carefully phrased

Both are correct and natural. English speakers can think of da bismo ... as something closer to so that we can/could ...

Because fotelju is the accusative singular of fotelja.

Here fotelju is the direct object of preneti:

• fotelja = nominative, dictionary form
• fotelju = accusative, used for the thing being moved

This is a regular pattern for many feminine nouns ending in -a:

• knjiga → knjigu
• soba → sobu
• fotelja → fotelju

Preneli comes from preneti (perfective), meaning to carry/move/transfer from one place to another.

The perfective is used because the speaker has one completed action in mind:

• moving that armchair from one place to another

If you used the imperfective prenositi, the focus would be more on the process, repetition, or ongoing action. Here the sentence is about achieving a single result, so preneti is the natural choice.

Because Serbian often omits subject pronouns when the verb form already makes the subject clear.

In this sentence:

• iznajmi already tells you the subject is you singular
• bismo already tells you the subject is we

So pronouns are unnecessary unless you want emphasis or contrast.

For example:

• Ti iznajmi kombi, da bismo mi preneli fotelju.

This is possible, but it sounds more emphatic, as if you are stressing you and we.

That is a matter of Ekavian vs. Ijekavian pronunciation/spelling.

• preneli = Ekavian
• prenijeli = Ijekavian

Both belong to standard varieties of Serbian, depending on region and style.

So the sentence you were given is in an Ekavian form, which is very common in Serbia.