Questions & Answers about Pečurke i paprike su spremne.
Because they are both plural feminine nouns in the nominative case here.
- pečurka = a mushroom
pečurke = mushrooms
- paprika = a pepper / paprika
- paprike = peppers
In this sentence, both nouns are the subject, so they appear in the nominative plural.
i means and.
So:
- Pečurke i paprike = Mushrooms and peppers
It is a very common conjunction and does not change form.
su is the 3rd person plural present-tense form of biti = to be.
So:
- ja sam = I am
- ti si = you are
- on/ona/ono je = he/she/it is
- mi smo = we are
- vi ste = you are
- oni/one/ona su = they are
Since pečurke i paprike is a plural subject, Serbian uses su = .