Ponekad perem odeću rano, a ponekad kasno.

Because the sentence contrasts two habits:

• Ponekad perem odeću rano = sometimes I wash clothes early
• a ponekad kasno = and sometimes late

Repeating ponekad makes the contrast clear and natural: sometimes ... and sometimes ...

You could think of it as:

• Sometimes I do it early, and sometimes late.

Perem is the 1st person singular present tense form of the verb prati / prati se? Here, specifically prati = to wash.

So:

• ja perem = I wash
• ti pereš = you wash
• on/ona pere = he/she washes

In this sentence, perem means I wash or I am in the habit of washing.

In Serbian, subject pronouns are often omitted because the verb ending already shows who the subject is.

• perem already means I wash

So Ja ponekad perem odeću rano... is possible, but ja is not necessary unless you want emphasis, contrast, or clarity.

For example:

• Ja perem odeću, a on sudove. = I wash the clothes, and he washes the dishes.

Because odeću is the accusative singular form, and it is the direct object of the verb perem.

• odeća = nominative singular
• odeću = accusative singular

Since I wash what? → clothes/clothing, Serbian uses the accusative:

• Perem odeću. = I wash clothes.

This is a very common pattern:

• Čitam knjigu. = I’m reading a book.
• Kupujem hleb. = I’m buying bread.

Literally, odeća means clothing / clothes.

In context, perem odeću can naturally be understood as I wash clothes. In everyday English, that often corresponds to I do the laundry, even though the Serbian wording is more literally about washing clothes.

A learner should know that in everyday Serbian, people also often say:

• perem veš = I’m doing the laundry / washing laundry

So perem odeću is understandable and correct, but perem veš may sound more everyday in some contexts.

Here a is a conjunction that often means something like:

• and
• while
• but
• whereas

It connects two parts and often suggests a mild contrast.

In this sentence:

• Ponekad perem odeću rano, a ponekad kasno.

the idea is:

• Sometimes I wash clothes early, and sometimes late.

So yes, and works, but a often has a slight contrastive flavor: this happens in one case, and in another case something different happens.

Because Serbian, like English, often omits repeated words when they are already understood.

The full version would be:

• Ponekad perem odeću rano, a ponekad perem odeću kasno.

But that sounds repetitive. So Serbian naturally shortens it to:

• Ponekad perem odeću rano, a ponekad kasno.

English does the same:

• Sometimes I wash clothes early, and sometimes late.

The second perem odeću is understood from the first clause.

Here they are adverbs.

• rano = early
• kasno = late

They describe when the washing happens, so they modify the verb perem.

Compare:

• rani voz = the early train → adjective
• Dolazim rano. = I arrive early → adverb

In your sentence, they are clearly adverbs.

Because this sentence describes a habit or repeated action: sometimes early, sometimes late.

For repeated, ongoing, or habitual actions, Serbian normally uses the imperfective verb. Here that is prati → perem.

If you used a perfective verb such as oprati, it would usually refer to a completed single action, not a general habit.

So:

• perem = I wash / I’m washing / I usually wash
• good for habits and repetition

That is why perem is the natural choice here.

Yes. Serbian word order is fairly flexible, although some versions sound more natural in certain contexts.

Your sentence is completely natural:

• Ponekad perem odeću rano, a ponekad kasno.

You could also hear:

• Ponekad rano perem odeću, a ponekad kasno.
• Odeću ponekad perem rano, a ponekad kasno.

The basic meaning stays the same, but moving words can change emphasis:

• putting rano/kasno earlier emphasizes time
• putting odeću earlier emphasizes the object

For a learner, the original sentence is a very good neutral model.

It is correct and easy to understand, but in everyday speech many speakers would also say:

• Ponekad perem veš rano, a ponekad kasno.

That can sound more like doing the laundry.

Very roughly:

• odeća = clothes/clothing
• veš = laundry / wash / things being washed

So your sentence is good Serbian, but it is useful to know that veš is very common in this kind of situation.

Odeću is pronounced approximately oh-DEH-choo, but with a softer ch sound than English ch.

About ć:

• ć is a soft consonant
• it is not exactly the same as English ch
• it sounds softer and more palatal

So:

• č = harder ch
• ć = softer ch

Learners often mix them up at first, which is very common. In odeću, the sound is ć, not č.

It sounds like a general habit or repeated pattern.

That comes from several things working together:

• ponekad = sometimes
• repeated twice = shows variation in habit
• perem = imperfective present, good for repeated action

So the sentence means something like:

• Sometimes I wash clothes early, and sometimes late as a general statement about your routine, not a single occasion.