Pokrivenost je dobra u gradu.

Because dobra has to agree with pokrivenost.

In Serbian, adjectives agree with the noun in:

• gender
• number
• case

Pokrivenost is a feminine singular noun, so the adjective must also be feminine singular:

• masculine: dobar
• feminine: dobra
• neuter: dobro

So Pokrivenost je dobra = The coverage is good.

Je is the 3rd person singular present tense of biti (to be).

So:

• ja sam = I am
• ti si = you are
• on/ona/ono je = he/she/it is

In this sentence, je means is:

• Pokrivenost je dobra = coverage is good

Also, je is a short clitic form, so it usually appears near the beginning of the sentence, often in the second position.

Because u can take different cases depending on meaning.

Here it means in the city, so it expresses location, and that requires the locative case:

• grad = city/town
• u gradu = in the city/town

Compare:

• u gradu = in the city → location
• u grad = into the city → movement/direction (accusative)

So in your sentence, u gradu is correct because the sentence describes where the good coverage is.

Because after u meaning in, the noun goes into the locative singular.

For the masculine noun grad, the locative singular form is:

• grad → gradu

So:

• grad = city
• u gradu = in the city

This is a normal declension pattern for many masculine nouns.

Yes, pokrivenost is a normal Serbian noun meaning coverage, but the exact type depends on context.

It can refer to things like:

• mobile/network signal coverage
• internet coverage
• media coverage
• coverage in a general sense

In a sentence like Pokrivenost je dobra u gradu, many learners would naturally understand it as something like signal/network coverage is good in the city, but the exact meaning comes from the larger context.

Because Serbian does not have articles like English a/an/the.

So Serbian simply says:

• u gradu = in the city / in the town

Whether English should use the, a, or no article at all depends on context when translating.

Serbian usually leaves definiteness to be understood from:

• context
• word order
• stress/emphasis
• the situation being discussed

Yes. Serbian word order is fairly flexible, although some positions are more natural than others.

The neutral version here is:

• Pokrivenost je dobra u gradu.

But you could also hear:

• U gradu je pokrivenost dobra.
• Dobra je pokrivenost u gradu.

These versions can shift the emphasis slightly:

• U gradu... emphasizes the location
• Dobra... emphasizes the quality

One important point: the short form je usually stays in second position, because it is a clitic.

It can mean either in the city or in town, depending on context.

The noun grad can mean:

• city
• town

So u gradu may be translated differently depending on what sounds natural in English and what place is being discussed.

A rough English-friendly pronunciation is:

PO-kree-veh-nost yeh DOH-bra oo GRA-doo

A few notes:

• j in Serbian sounds like English y in yes
• r is rolled or tapped
• stress is not usually marked in normal writing

Letter-by-letter:

• Pokrivenost → po-kri-ve-nost
• je → ye
• dobra → do-bra
• u → oo
• gradu → gra-doo

Yes, if the context is already clear.

For example, in conversation someone might say:

• Dobra je u gradu.

But that only works if everyone already knows what it refers to.

The full sentence:

• Pokrivenost je dobra u gradu.

is clearer and more natural when introducing the topic or when ambiguity is possible.

In Cyrillic, it is:

Покривеност је добра у граду.

Serbian regularly uses both scripts:

• Latin: Pokrivenost je dobra u gradu.
• Cyrillic: Покривеност је добра у граду.

Both are standard.