Questions & Answers about Nedostaje mi novac.
Because mi is the dative form of ja.
With nedostajati, Serbian usually uses this pattern:
- something
- nedostaje
- someone in the dative
- nedostaje
So in Nedostaje mi novac, the idea is structurally closer to:
- Money is lacking to me
That is why Serbian uses mi rather than ja.
Some dative forms of personal pronouns are:
- mi = to me
- ti = to you
- mu / joj = to him / to her
- nam / vam / im = to us / to you (plural/formal) / to them
Because the verb agrees with novac, not with mi.
In this sentence, novac is the grammatical subject, and novac is singular. So the verb must also be singular:
- novac nedostaje
The word mi is just the indirect object in the dative case, so it does not control the verb form.
Compare:
- Nedostaje mi novac. = singular subject
- Nedostaju mi pare. = plural subject
In the second sentence, pare is plural, so the verb becomes nedostaju.