Questions & Answers about Zub je oštećen.
- zub = tooth
- je = is (3rd person singular present of biti, to be)
- oštećen = damaged
So grammatically, zub is the subject, je is the verb, and oštećen describes the state of the tooth.
Because zub is the subject of the sentence, it appears in the nominative singular.
- zub = nominative singular, tooth
- zuba can be genitive singular or accusative plural in other contexts
In Zub je oštećen, the sentence is simply stating something about the tooth, so nominative is the correct case.
Je is the present-tense form of biti (to be) for he/she/it is.
Serbian often forms sentences like this the same way English does:
- Zub je oštećen = The tooth is damaged
Without je, the sentence would sound incomplete in standard Serbian.