Breakdown of Večeras moram spakirati torbu za sutrašnji put u Zagreb.
Questions & Answers about Večeras moram spakirati torbu za sutrašnji put u Zagreb.
Večeras means this evening / tonight. It is an adverb of time, so it tells you when the action happens.
In this sentence, it modifies moram spakirati:
Večeras moram spakirati... = Tonight I have to pack...
It is different from večer (evening), which is a noun.
Croatian usually does not need an explicit subject pronoun when the verb already shows who is doing the action.
Here, moram means I must / I have to, so ja (I) is understood automatically.
You could say Ja večeras moram spakirati torbu..., but ja is usually added only for emphasis, contrast, or clarity.