OVO JE = this is. OVO SU = these are. One word tells you whether you're pointing at one thing or several — no plural -s needed anywhere else in the sentence.
English marks plural on the noun (book → books) and barely touches the verb (is → are). Serbian does the reverse for "this is/these are": the noun changes its own ending for plural, and so does the verb — but you don't need to know noun plurals yet to get this right. Just look at the ending in front of you: if it already looks plural, use su; if it's a single thing, use je.
1. Ovo olovke.
2. Ovo pica.
3. Ovo salata.
4. Ovo knjige.
5. Ovo cipele.
6. Ovo voće.
7. Ovo olovka.
8. Ovo knjiga.
9. Ovo cipela.
10. Ovo voda.
SR (lat): Odgovori nisu osetljivi na velika/mala slova, i može latinicom ili ćirilicom.
СР (ћир): Одговори нису осетљиви на велика/мала слова, и може латиницом или ћирилицом.
EN: Answers are not case-sensitive, and can be typed in Latin or Cyrillic script.
Igra, pa upotreba
Ista gramatika, drugo raspoloženje — Verb Run: BITI.
He, she, it, they — Serbian's three genders are next.
Next: Am, Is, or Are →