Questions & Answers about Ljeti volim sunčane dane bez oblaka.
Ljeti functions as an adverb meaning “in summer / in the summertime / during summer (in general)”.
- The base noun is ljeto (“summer”).
- From this noun, an adverbial form ljeti is made, and that is what you use to say “in summer” in a general, habitual sense.
- Grammatically, in modern Croatian you just treat ljeti as an adverb of time, not as a regular case form you decline.
So in this sentence Ljeti volim… = “In summer I like…”, with ljeti acting like an English time adverb (similar to “usually”, “often”, etc., in terms of position in the sentence).