Questions & Answers about Zdrav sam kada ne jedem mnogo šećera.
Because zdrav has to agree with the speaker.
- zdrav sam = a male speaker
- zdrava sam = a female speaker
Serbian adjectives agree in gender and number. Since the subject I is understood rather than stated, the adjective still shows whether the speaker is male or female.
Because sam is a clitic in Serbian, and clitics usually go in second position in the clause.
So these are natural:
- Zdrav sam
- Ja sam zdrav
But Sam zdrav is not normal standard word order.
This is a very common Serbian pattern:
- Umoran sam
- Srećan sam
- Spreman sam
The clitic sam comes right after the first element.