Questions & Answers about Skiper mirno drži kormilo.
Skiper is nominative singular. It is the subject of the sentence, so Croatian uses the nominative case.
The dictionary form of a noun is usually the nominative singular, so this is also the basic form you would normally learn first.
Skiper is a masculine noun.
Because mirno is an adverb, not an adjective here.
- miran = calm (masculine adjective)
- mirna = calm (feminine adjective)
- mirno can be:
- the neuter adjective form, or
- an adverb meaning calmly
In this sentence, mirno describes how the skipper holds the helm, so it modifies the verb drži. That makes it an adverb: calmly.