Někteří veterináři pracují ve městě.

Because někteří has to agree with veterináři.

• veterináři is masculine animate plural nominative because it refers to male/mixed-gender people or people in general.
• The word některý means some / certain, and its form changes like an adjective.
• For masculine animate plural nominative, the correct form is někteří.

So:

• singular masculine animate: některý veterinář
• plural masculine animate: někteří veterináři

If the noun were a different gender, you would use a different form.

Veterináři is the nominative plural form of veterinář.

• singular: veterinář = a veterinarian
• plural: veterináři = veterinarians

This is a common plural pattern for masculine animate nouns ending in -ář.

Because this noun is the subject of the sentence, it appears in the nominative case, and in the plural that gives veterináři.

Pracují is the 3rd person plural present tense form of pracovat = to work.

Since the subject is plural:

• někteří veterináři = some veterinarians

the verb must also be plural:

• pracují = they work / are working

A quick comparison:

• Veterinář pracuje. = The veterinarian works.
• Veterináři pracují. = The veterinarians work.

In Czech, the present tense often covers both English work and are working, depending on context.

Ve is a variant of v.

Both mean in, but Czech often uses ve instead of v to make pronunciation easier, especially before certain consonants or consonant clusters.

So:

• ve městě is the normal form here

You should think of ve and v as the same preposition, just with slightly different pronunciation forms.

Other common examples:

• ve škole = in the school
• ve středu = on Wednesday
• v Praze = in Prague

Because after the preposition v / ve meaning in, Czech usually uses the locative case.

The noun město changes like this:

• nominative singular: město
• locative singular: městě

So:

• město = city, town
• ve městě = in the city / in town

This is one of the most important things to learn in Czech: prepositions often require specific cases.

Yes. Czech word order is more flexible than English because the case endings show what each word is doing.

The basic sentence:

• Někteří veterináři pracují ve městě.

You could also say:

• Ve městě pracují někteří veterináři.
• Někteří veterináři ve městě pracují.

These versions are still grammatical, but the emphasis changes.

For example:

• Někteří veterináři pracují ve městě. = neutral statement
• Ve městě pracují někteří veterináři. = puts more focus on in the city
• Někteří veterináři ve městě pracují. = may contrast with somewhere else

For beginners, the original word order is a good neutral pattern.

A rough guide:

• ně sounds approximately like nye
• kte is like kte
• ří contains the Czech sound ř, which is difficult for English speakers

So the word is roughly:

• nyek-te-rzhee or nyek-te-zhree

But that is only approximate.

Important points:

• ě often makes the preceding consonant sound softer, and after n it gives something like ně = nye
• ř is a special Czech sound, something between r and zh

If you cannot say ř perfectly at first, that is normal.

Ř is one of the most famous Czech sounds, and it does not exist in standard English.

It is usually described as a kind of rolled or raised r mixed with a zh sound.

For learners, a practical approach is:

• first learn to hear it
• then aim for an approximation
• do not worry if it is not perfect right away

In these words:

• veterináři
• někteří

the ř is part of the normal spelling and pronunciation. Native speakers will still usually understand you if your ř sounds closer to r or zh, especially at beginner level.

It means only some of them.

• někteří veterináři = some veterinarians
• veterináři by itself could mean veterinarians in general, depending on context

So někteří adds the idea that this is not everyone, just a part of the group.

Czech does not have articles like English a, an, and the.

So Czech usually expresses those ideas through:

• context
• word order
• words like nějaký, ten, někteří, etc.

In this sentence, někteří already gives the meaning some.

That is why Czech can say:

• Někteří veterináři pracují ve městě.

without any separate word corresponding exactly to English the or a.