Ja sam umoran svako veče.

You usually cannot say Sam umoran svako veče by itself, because sam is an unstressed clitic and normally does not stand at the very beginning of a sentence.

You have two natural options:

• Ja sam umoran svako veče.
• Umoran sam svako veče.
• Svako veče sam umoran.

So ja can be included, but it is often left out in Serbian because the verb form sam already shows the subject is I. When ja is present, it can add a little emphasis or contrast.

Sam is the 1st person singular present tense of biti (to be).

So:

• ja sam = I am
• ti si = you are
• on/ona/ono je = he/she/it is

In this sentence, sam links the subject ja with the adjective umoran:

• Ja sam umoran = I am tired

Because umoran is an adjective, and in Serbian adjectives must agree with the person’s gender and number.

For a male speaker:

• Ja sam umoran.

For a female speaker:

• Ja sam umorna.

For a plural group:

• Mi smo umorni.

So the form umoran tells you the speaker is masculine singular.

It is an adjective meaning tired.

The structure is:

• ja = subject
• sam = verb to be
• umoran = adjective

So Serbian builds this the same basic way English does in I am tired.

Svako veče means every evening.

It is made of:

• svako = every (neuter singular form)
• veče = evening (neuter singular noun)

Together they form a time expression used adverbially: every evening.

In svako veče, the noun veče is in the accusative singular, which for this neuter noun looks the same as the nominative.

This kind of accusative is often used for time expressions, especially with meanings like:

• every day
• every week
• every evening

Because veče is neuter singular, svaki changes to svako to agree with it.

Yes. Svake večeri is also natural and also means every evening.

So both are possible:

• Ja sam umoran svako veče.
• Ja sam umoran svake večeri.

The difference is mostly grammatical style, not basic meaning:

• svako veče uses a form based on every + evening
• svake večeri uses a genitive time expression

Both are common, and learners should understand both.

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

These are all natural:

• Ja sam umoran svako veče.
• Umoran sam svako veče.
• Svako veče sam umoran.
• Ja sam svako veče umoran.

The meaning stays basically the same, but the focus can shift a little:

• Svako veče sam umoran emphasizes every evening
• Umoran sam svako veče emphasizes tired

One important rule: the clitic sam usually comes in the second position of its clause.

Because Serbian often simply says to be tired with biti + adjective:

• Ja sam umoran = I am tired

If you want to express becoming tired, you can use other verbs, but in this sentence Serbian is just stating a condition: I am tired every evening.

So sam umoran is the normal and direct way to say it.

A woman would say:

• Ja sam umorna svako veče.

The only change is:

• umoran → umorna

That is because the adjective must agree with the speaker’s gender.

Veče is pronounced roughly like VEH-cheh.

The letter č sounds like the ch in church, but typically a bit firmer and cleaner.

So:

• veče ≈ VEH-cheh

Also note that Serbian spelling is very phonetic, so words are usually pronounced much as they are written.