Breakdown of Treba mu koristan dodatak za računalo.
trebati
to need / should (ought to)
računalo
computer
za
for / at (a table) (+ instrumental)
mu
to him
koristan
useful
dodatak
accessory / addition, supplement
Questions & Answers about Treba mu koristan dodatak za računalo.
Why is it koristan and not korisni?
Koristan is the indefinite form of the adjective, meaning a useful accessory. We use the indefinite form because we are introducing a new, non-specific item. If we were talking about a specific accessory we already mentioned (the useful accessory), we would use the definite form korisni.
Why does koristan have an a before the n, while the definite form korisni does not?
This is because of the fleeting a (nepostojano a). In Croatian, an a is often squeezed between two consonants at the end of a word to make it easier to pronounce, like in the masculine indefinite koristan. When we add an ending that starts with a vowel, like the definite -i, that extra a drops out, making it korisni.
Why do we use mu (to him) instead of on (he) with the verb trebati?
The verb trebati (to need) is frequently used with the dative case for the person who needs something. Instead of saying he needs, the Croatian structure literally translates to a useful accessory is needed to him. That is why we use the dative pronoun mu.
What case is koristan dodatak in this sentence?
It is in the nominative case. Because we are using the dative plus trebati structure (treba mu), the thing that is needed (koristan dodatak) actually acts as the grammatical subject of the sentence.
Why is it za računalo and not the dative or locative case?
When the preposition za is used to mean for (indicating purpose or intended use), it must be followed by the accusative case. Because računalo is a neuter noun, its accusative form looks exactly the same as its nominative form.
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