Questions & Answers about Pokrivenost mrežom je važna.
Mrežom is the instrumental singular of mreža (network).
In the phrase pokrivenost mrežom, Croatian uses the instrumental to express the idea of being covered by something or with something. So the structure is:
- pokrivenost = coverage
- mrežom = by/with network
Literally, it is something like coverage with a network or coverage by the network.
This is a common pattern with nouns related to covering or filling:
- prekriven snijegom = covered with snow
- napunjen vodom = filled with water
So pokrivenost mrežom is grammatically natural in Croatian.
It is the instrumental case, singular.
The noun is:
- nominative: mreža
- genitive: mreže
- dative/locative: mreži
- accusative: mrežu
- vocative: mrežo
- instrumental: mrežom
In this sentence, instrumental is used because the noun expresses what provides the coverage.