Registar davalaca ima krvnu grupu.

The sentence has a straightforward subject + verb + object structure:

• Registar davalaca = the subject
• ima = the verb
• krvnu grupu = the direct object

More specifically:

• registar is in the nominative singular
• davalaca depends on registar
• ima is 3rd person singular present
• krvnu grupu is in the accusative singular

So grammatically, it works like The register of donors has blood type / a blood type.

Because Serbian is using a noun + genitive structure to express what English often expresses with of.

• registar davalaca = register of donors

Here, davalaca is genitive plural, not nominative plural.

Compare:

• davaoci = donors as the subject
• davalaca = of donors

So if you said Davaoci imaju..., that would mean The donors have...
But Registar davalaca... means The register of donors...

It is genitive plural.

Serbian very often uses the genitive after another noun to show a relationship like:

• the register of donors
• the name of the city
• the door of the house

So:

• registar = register
• davalaca = of donors

This is one of the most common uses of the genitive in Serbian.

Because krvnu grupu is the direct object of the verb ima, and direct objects normally go in the accusative.

The dictionary form is:

• krvna grupa = nominative singular

But after ima, it changes to accusative:

• krvnu grupu

Both the adjective and the noun change:

• krvna → krvnu
• grupa → grupu

This is a standard feminine singular accusative pattern.

Ima is the 3rd person singular present tense of imati, meaning to have.

So here it means:

• has

This is the same form you see in many basic sentences:

• On ima knjigu = He has a book
• Ona ima sestru = She has a sister

Serbian ima can also sometimes mean there is / there are, but that is a different usage. In this sentence, it clearly means has.

Because Serbian does not have articles like English.

There is no direct equivalent of a or the that must appear before nouns in normal sentences.

So registar can mean:

• a register
• the register

And krvnu grupu can mean:

• a blood type
• the blood type

The exact meaning depends on context.

If Serbian wants to be more specific, it can use words like:

• jedan = one, a certain
• taj = that, the one already known
• ovaj = this

But usually no article is used.

Not completely.

The given sentence uses a very normal, neutral order:

• Registar davalaca ima krvnu grupu.

That is the most straightforward way to say it.

But Serbian word order is more flexible than English, and speakers can move parts around for emphasis. For example:

• Krvnu grupu ima registar davalaca.

That would sound more marked and would emphasize krvnu grupu.

So the original order is the neutral one, but other orders are possible depending on focus and style.

Yes, it is a correct Serbian word meaning donor or giver, depending on context.

However, in medical or administrative language, Serbian also often uses donor.

So both of these can exist:

• registar davalaca
• registar donora

In some contexts, registar donora may sound more natural to modern speakers, especially in medical settings. But davalac is still perfectly valid and understandable.

It is grammatically correct, but whether it sounds fully natural depends on what exactly you mean.

As written, it literally says that the register has a blood type. That is understandable, but in many real contexts Serbian speakers might prefer something like:

• Registar davalaca sadrži podatak o krvnoj grupi.
• U registru davalaca upisana je krvna grupa.

Those versions make it clearer that the register contains information about blood type, rather than the register itself somehow having one.

So for grammar practice, the sentence is useful. In real-life usage, a Serbian speaker might choose a slightly different wording.

This noun belongs to a pattern that can be tricky for learners.

The base form is:

• davalac = donor

But in other forms, the word changes shape:

• davalac = nominative singular
• davaoci = nominative plural
• davalaca = genitive plural

So this is not a simple add-an-ending pattern. The stem changes a bit, which is normal for some masculine nouns of this type.

For learners, the important thing is to recognize:

• davalac = dictionary form
• davalaca = genitive plural form used after registar

Yes, this word can feel difficult at first.

krvnu is pronounced roughly like krv-noo, but with an important Serbian feature: the r can act almost like a vowel.

So in krv, there is no extra vowel inserted between k and r.
You should not say something like kuh-riv or ker-v.

A rough guide:

• krv = one compact syllable with a rolled or tapped r
• krvnu = krv-nu

This kind of consonant cluster is normal in Serbian, even though it feels unusual to English speakers.