Trošak je redovan.

Trošak means cost, expense, or expenditure. It is a masculine noun in Serbian.

In this sentence, it refers to the expense/cost as the subject of the sentence.

Je means is. It is the 3rd person singular present tense of the verb biti (to be).

So:

• trošak = expense / cost
• je = is
• redovan = regular

That gives The cost/expense is regular.

Because redovan is an adjective, and in Serbian adjectives must agree with the noun they describe in gender, number, and case.

Here:

• trošak is masculine
• singular
• nominative

So the adjective also takes the masculine singular nominative form:

• masculine: redovan
• feminine: redovna
• neuter: redovno

That is why Trošak je redovan is correct.

It is in the nominative singular.

That is because trošak is the subject of the sentence, and subjects are normally in the nominative case.

So:

• dictionary form: trošak
• case here: nominative singular

Usually yes, but the nuance depends on context.

Redovan can mean:

• regular
• recurring
• routine
• normal/scheduled

So Trošak je redovan often suggests that the expense is recurring or part of the normal pattern, not a one-time or unusual cost.

Yes, it is grammatically correct and understandable.

However, whether it sounds fully natural depends on context. In everyday speech, Serbian speakers might often use more specific wording, for example:

• Ovo je redovan trošak. = This is a regular expense.
• To je redovan trošak. = That is a regular expense.

The original sentence is still fine, especially in formal, financial, or explanatory contexts.

Yes, Serbian word order is more flexible than English word order.

The neutral order here is:

• Trošak je redovan.

You may also see:

• Redovan je trošak.

But that version is more marked and may sound stylistically different, with extra emphasis on redovan.

For a learner, Trošak je redovan is the safest and most neutral version.

Normally, no. In a standard full sentence like this, je is needed.

So:

• Trošak je redovan. = correct
• Trošak redovan. = not a normal complete sentence in standard Serbian

You might see the verb omitted in headlines, notes, or very telegraphic style, but in regular speech and writing, keep je.

The noun, verb, and adjective would all change to match the plural.

Singular:

• Trošak je redovan.

Plural:

• Troškovi su redovni. = The expenses/costs are regular.

Changes:

• trošak → troškovi
• je → su
• redovan → redovni

The adjective would change to agree with the feminine noun.

For example:

• Cena je redovna. = The price is regular
• Isplata je redovna. = The payment is regular

So the adjective forms are:

• masculine: redovan
• feminine: redovna
• neuter: redovno

The dictionary form is biti, which means to be.

The form je is one present-tense form of that verb.

A few common present forms are:

• sam = I am
• si = you are
• je = he/she/it is
• smo = we are
• ste = you are
• su = they are

So in this sentence, je agrees with the singular subject trošak.

A rough English approximation is TROH-shak.

A few points:

• š sounds like English sh
• the stress is on the first syllable: tróšak

So:

• trošak ≈ TROH-shak

They are related, but not the same.

• trošak = cost/expense in the sense of money spent or incurred
• cena = price, the amount something costs to buy

So:

• Trošak je redovan. = The expense is regular / recurring
• Cena je visoka. = The price is high

A trošak is often something you pay over time or as part of running something, while cena is often the listed or purchase price.