This is the 566th most frequent Serbian word.
улице
"Улице" in English means "streets."
In this sentence, 'улице' is the plural nominative case, representing 'streets' as the subject of the sentence.
Улице су биле прекривене снегом.
The streets were covered with snow.
Here, 'улице' changes to 'улици' due to the locative case, indicating the location where the action takes place.
Видео сам игру деце на улици.
I saw children playing in the street.
In this case, 'улице' is in the genitive singular form, showing possession or specification of the described street.