Moja sestra sada čisti pod, a ja perem sudove.

Because sestra is a feminine noun, and the possessive adjective moj must agree with it in gender, number, and case.

• masculine: moj brat = my brother
• feminine: moja sestra = my sister
• neuter: moje dete = my child

Here, sestra is feminine singular, so moja is the correct form.

Sestra is the subject of the clause, so it is in the nominative case, which is the basic dictionary form.

In Moja sestra sada čisti pod, the person doing the action is moja sestra, so nominative is used.

Sada means now.

It does not have to stay only in that one position. Serbian word order is fairly flexible, so you may also hear:

• Moja sestra čisti pod sada
• Sada moja sestra čisti pod

But Moja sestra sada čisti pod sounds very natural and neutral.

Because they come from different verbs and follow different conjugation patterns.

• čistiti = to clean

  • ja čistim
  • ti čistiš
  • on/ona čisti

• prati = to wash

  • ja perem
  • ti pereš
  • on/ona pere

So in the sentence:

• sestra ... čisti = she cleans / is cleaning
• ja perem = I wash / am washing

The endings are different because the verbs belong to different conjugation types.

Yes, this is something learners often notice. The infinitive prati does not keep the exact same stem in the present tense.

You get:

• prati = to wash
• ja perem
• ti pereš
• on/ona pere
• mi peremo

So you should learn prati together with its present stem per-. This kind of stem change is normal in Serbian and is best memorized as part of the verb.

Because pod is a masculine inanimate noun, and in the accusative singular it looks the same as the nominative singular.

So:

• nominative: pod = floor
• accusative: pod = floor

Since čisti pod means cleans the floor, pod is the direct object, so it is accusative — but for this kind of noun, accusative singular does not visibly change.

Because sudove is the accusative plural form, while sudovi is nominative plural.

• sudovi = dishes (as the subject)
• sudove = dishes (as the direct object)

In ja perem sudove, the dishes are receiving the action, so they must be in the accusative plural.

This is a very common pattern for masculine inanimate nouns:

• nominative plural: -i
• accusative plural: -e

For example:

• gradovi / gradove
• stolovi / stolove
• sudovi / sudove

A often connects two clauses with a mild contrast or topic shift. Here it is something like:

• My sister is cleaning the floor, and/as for me, I’m washing the dishes.

It is not a strong contradiction like but, but it does highlight a difference between the two parts.

Compare:

• i = and, simple addition
• a = and/but/while, with contrast or switch of focus

So a ja perem sudove sounds very natural because it contrasts my sister with I and one activity with another.

That is correct: Serbian often leaves out subject pronouns because the verb ending already shows the person.

So perem sudove by itself already means I am washing the dishes.

But ja is included here for emphasis or contrast:

• Moja sestra sada čisti pod, a ja perem sudove.

This feels like:

• My sister is cleaning the floor, and I am washing the dishes.

The pronoun helps stress the contrast between sestra and ja.

It can technically do both in Serbian, just like English simple present and present continuous sometimes overlap in translation.

But because of sada = now, the sentence clearly refers to an action happening right now:

• čisti = is cleaning
• perem = am washing

Without sada, the sentence could also be understood more generally depending on context.

They are being used as imperfective verbs, which is exactly what you expect for actions in progress.

In Serbian, imperfective verbs are commonly used for:

• ongoing actions
• repeated actions
• habitual actions

Since the sentence describes what is happening now, imperfective is the natural choice:

• čistiti = to be cleaning / to clean
• prati = to be washing / to wash

A perfective verb would usually not be used the same way for an action currently in progress.

Yes. Serbian word order is much more flexible than English because case endings help show who is doing what.

Possible variations include:

• Moja sestra sada čisti pod, a ja perem sudove.
• Sada moja sestra čisti pod, a ja perem sudove.
• Pod moja sestra sada čisti, a sudove ja perem.

However, not all versions sound equally natural in neutral conversation. The original sentence is the most straightforward and natural for everyday use.

Č is pronounced like the ch in chocolate, but usually a bit firmer.

So čisti sounds roughly like CHEE-stee.

A few useful pronunciation notes from this sentence:

• č = like ch
• š = like sh
• j = like English y
• c = like ts

So:

• čisti ≈ CHEE-stee
• ja ≈ ya
• sudove ≈ SOO-do-ve

Yes, absolutely. That would still be grammatical.

• Moja sestra čisti pod, a perem sudove.

The meaning is still clear because perem already shows I.

The version with ja simply adds more contrast and emphasis. So:

• ... a perem sudove = neutral
• ... a ja perem sudove = more contrastive, more explicit

Both are correct.