Questions & Answers about Kupac je pouzdan i kupoprodaja nije prevara.
They are forms of the verb biti, which means to be.
- je = is
- nije = is not
So the sentence has two linked statements:
- Kupac je pouzdan = the buyer is reliable
- kupoprodaja nije prevara = the sale/purchase is not a fraud or scam
Because je is a clitic in Serbian. Clitics usually stand in the second position of the clause, not necessarily where English would place them.
So Serbian naturally says:
Kupac je pouzdan
not normally:
Je kupac pouzdan
In a simple sentence like this, the first word is kupac, so je comes right after it.
In standard Serbian, the negative present-tense forms of biti are written as single words:
- nisam
- nisi
- nije
- nismo
- niste
- nisu
So nije is simply the normal form meaning is not.