Hi Aquarius. The answer on your question could be a bit complicated. But, 1. Neka, neki, neko (adjcetive) = some woman, man, child . NEKIM čudom = in some strange way. . u NEKO doba = very late. . prije NEKOG vremena = some time ago. CASES!!! 2. Noun. NEKIMA se koncert dopao. 3. Adverbs. Radio sam NEKIH (around) pola sata. 4. interjct. NEKA ,ja ću to uradti. ( it is O.K. I will do it). There are some more explanation. If you need them , let me know. .

Neka = let (it) https://en.wiktionary.org/wiki/neka onda = then Neka onda gori = let it burn then (subject is omitted)

Imperative in Croatian: singular 1) - 2) (ti) gori! 3) (on,ona, ono) neka gori! plural 1) (mi) gorimo! 2) (vi) gorite! 3) (oni, one, ona) neka gore! onda = then