Ova vrsta prevoza je dobra.

Because ova has to agree with vrsta, which is a feminine singular noun.

In Serbian, demonstratives like this change form depending on gender:

• ovaj = this (masculine)
• ova = this (feminine)
• ovo = this (neuter)

Since vrsta is feminine, the correct form is ova vrsta.

Because the adjective dobra agrees with the main noun of the subject, which is vrsta, not with prevoza.

The structure is:

• ova vrsta = this type
• prevoza = of transport

So the sentence is built around vrsta. The meaning is literally:

• This type of transport is good

Since vrsta is feminine, the predicate adjective must also be feminine:

• vrsta je dobra

That is why you get dobra, not dobar or dobro.

Because after vrsta you normally use the genitive case.

This is a very common pattern in Serbian:

• vrsta nečega = a type of something
• čaša vode = a glass of water
• grupa ljudi = a group of people

So:

• prevoz = transport
• prevoza = of transport

That is why vrsta prevoza means type of transport.

Vrsta is in the nominative singular because it is the subject of the sentence.

You can test this by asking What is good?

Answer: Ova vrsta prevoza.

Since that whole phrase is the subject, its head noun vrsta is nominative.

Je is the 3rd person singular present tense of the verb biti = to be.

So:

• je = is

In this sentence, it links the subject and the description:

• Ova vrsta prevoza = the subject
• je dobra = is good

Unlike in some other Slavic languages, Serbian normally does use this form of to be in the present tense in sentences like this.

In normal standard Serbian, no—not in this kind of sentence.

You need je in:

• Ova vrsta prevoza je dobra.

Leaving it out would sound ungrammatical in standard Serbian.

Serbian does allow dropping some pronouns, but not the copula je here.

Because Serbian often expresses of-relationships by putting the second noun in the genitive.

So instead of using an English-style noun-noun compound like transport type, Serbian prefers:

• vrsta prevoza = type of transport

This is one of the most important structural differences for English speakers. Serbian usually avoids stacking nouns the way English does.

Yes. Serbian word order is fairly flexible, although not completely free.

The neutral order here is:

• Ova vrsta prevoza je dobra.

But other orders are possible for emphasis, for example:

• Dobra je ova vrsta prevoza. = This type of transport is good.
• Ova vrsta prevoza dobra je is much less natural in everyday speech.

So the original sentence is the most straightforward and neutral version.

Often yes, but the exact nuance depends on context.

Prevoz can mean:

• transport
• transportation
• transit
• carriage
• a ride / means of transport in some contexts

In vrsta prevoza, it is very natural to translate it as type of transport or type of transportation.

A very common clue is the ending -a, which often signals a feminine noun in Serbian.

So:

• vrsta looks feminine
• and it behaves like a feminine noun:
  • ova vrsta
  • dobra vrsta

This is not a perfect rule for every noun, but it works very often and is a useful first guess.

The dictionary forms are:

• ova → from ovaj / ova / ovo = this
• vrsta = type, kind
• prevoza → dictionary form prevoz = transport
• je → from biti = to be
• dobra → dictionary form dobar = good

A learner should pay special attention to prevoza, because that is not the dictionary form—it is the genitive singular form of prevoz.

A simple pronunciation guide is:

• Ova = OH-vah
• vrsta = roughly VUR-stah or VR-stah
• prevoza = PREH-voh-zah
• je = yeh
• dobra = DOH-brah

A few useful notes:

• Serbian r is usually trilled or tapped.
• j is pronounced like English y in yes.
• Stress is not usually marked in normal writing, so learners often need to hear words spoken aloud to master it naturally.

Yes, that is possible, because transport also exists in Serbian.

So both are possible:

• Ova vrsta prevoza je dobra.
• Ova vrsta transporta je dobra.

But prevoz is often a bit more everyday and broad in many contexts. The best choice depends on the situation and regional preference.