Questions & Answers about Dječak čvrsto drži crveni balon.
Dječak is in the nominative singular because it is the subject of the sentence: the boy is the one doing the action.
The basic dictionary form is dječak = boy.
In this sentence:
- dječak = subject
- drži = verb
- balon = object
So the structure is basically subject + adverb + verb + object.
Držati is the infinitive, meaning to hold.
Drži is the 3rd person singular present tense form, meaning he/she/it holds.
It matches dječak, which is he:
- ja držim = I hold
- ti držiš = you hold
- on/ona drži = he/she holds
So Dječak drži... literally means The boy holds...