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koristiti (se) perfective verb to be useful , to be use
koristim (se) I am useful
koristiš (se) you are useful (singular & informal)
koristite (se) you are useful (plural or polite)
ona (se) koristi she is useful
koristimo (se) we are useful
koriste (se) they are useful
koristi (se) (se)useful! (singular & informal)
koristite (se) be useful! (plural or polite)
on je (se) koristio he was useful
ona je (se) koristila she was useful
ono je (se) koristilo it was useful
oni su (se) koristili they were useful (masculine)
one su (se) koristile they were useful (feminine)
ona su (se) koristila they were useful (neuter)