Dobrovolníci třídí oblečení a obuv podle stavu.

Dobrovolníci is the plural of dobrovolník, meaning volunteers.

• dobrovolník = one male volunteer / a volunteer in general
• dobrovolníci = volunteers

A feminine singular form is dobrovolnice.

In this sentence, dobrovolníci is the subject, so it is in the nominative plural.

Třídí is the 3rd person plural present tense of třídit, which means to sort or to classify.

So:

• já třídím = I sort
• ty třídíš = you sort
• on/ona třídí = he/she sorts
• oni/ony třídí = they sort

Because dobrovolníci means they, the verb is třídí.

Oblečení is grammatically singular neuter, but its meaning is often collective, like clothing in English.

That means it behaves a bit like a mass noun:

• oblečení = clothing

Even though English learners may think of clothes as plural, Czech often uses oblečení as a singular noun.

In this sentence, oblečení is in the accusative, but for this noun the form is the same as the nominative:

• to oblečení (nominative)
• vidím oblečení (accusative)

Obuv means footwear. It is a general, somewhat formal or neutral word covering shoes, boots, sandals, etc.

So the sentence is talking about sorting:

• oblečení = clothing
• obuv = footwear

A more everyday word for shoes specifically would be boty, but obuv is broader and fits well in contexts like donations, inventory, aid work, or sorting items.

They are in the accusative case, because they are the direct objects of the verb třídí.

The volunteers are sorting what?

• oblečení
• obuv

So both are objects.

Their forms happen to look unchanged here:

• oblečení stays oblečení
• obuv stays obuv

This is normal for many Czech nouns.

The preposition podle always takes the genitive case.

So:

• stav = condition, state
• stavu = genitive singular

That is why Czech says:

• podle stavu = according to the condition / by condition

This is a very useful pattern to remember:

• podle pravidel = according to the rules
• podle zákona = according to the law
• podle velikosti = by size / according to size

Here podle stavu means something like:

• according to condition
• based on condition
• by condition

In context, it means the volunteers sort the clothing and footwear depending on whether the items are, for example:

• in good condition
• damaged
• clean
• wearable
• unusable

So stav here means the physical condition of the items.

A simply means and.

So:

• oblečení a obuv = clothing and footwear

This is the normal coordinating conjunction used to join two nouns.

Yes. Czech word order is more flexible than English word order because grammatical roles are often shown by case endings rather than position.

The neutral order here is:

• Dobrovolníci třídí oblečení a obuv podle stavu.

But you could also see:

• Oblečení a obuv dobrovolníci třídí podle stavu.
• Podle stavu dobrovolníci třídí oblečení a obuv.

These versions may shift the emphasis, but the basic meaning stays the same.

The hardest part for many learners is ř, which is a special Czech sound.

• třídí is approximately tree-dee, but with ř instead of a normal r
• ř is a raised, fricative r sound, something between r and zh

A few helpful points:

• Czech stress is usually on the first syllable
• So: DOB-ro-vol-ní-ci
• TŘÍ-dí
• o-BLE-če-ní
• O-buv
• POD-le STA-vu

You do not need perfect ř right away; learners usually improve it over time.

Sometimes, yes, but it changes the nuance.

• třídit = to sort, to be sorting, to sort as an activity
• roztřídit = to sort out, to sort into categories, often with a sense of completion

So Dobrovolníci třídí... sounds natural if you are describing what the volunteers do in general or what they are doing right now.

If you wanted to emphasize finishing the sorting, Czech might use a perfective verb in a different context, but not usually in a simple present statement like this one.

Czech does not use articles like English a, an, or the.

So a Czech sentence like this can mean, depending on context:

• volunteers sort clothing and footwear according to condition
• the volunteers sort the clothing and footwear according to condition
• volunteers are sorting clothing and footwear by condition

Context tells you whether the meaning is definite or general.

That is very normal in Czech, and learners gradually get used to reading definiteness from context rather than from articles.