Case in the sentence

NOMINATIVE

used without prepositions

questions:
Ko? Šta?
Who? What?

meanings:

-Subject

NIKOLA trči.
NIKOLA is running.

-Noun which is a part of predicate

Život je MORE.
Life is SEA.

GENITIVE

used with and without prepositions

questions:
Koga? Čega?
Of who? Of what?

meanings:

-Belonging

Ovo je bicikl ZORANA POPADIĆA.
This is bicycle of ZORAN POPADIC.

-Part, quaitity

Imaš li malo VREMENA?
Do you have a little TIME?

-Parting, origination

Ja sam rodom iz BEOGRADA.
I was born in BELGRADE. (Literally: I'm from Belgrade by birth)

-Quality

Anja je devojčica MODRIH OČIJU.
Anja is a BLUE EYED girl. (Literally: Anja is a blue eyes' girl).

-Time

Nisam ga videla od PONEDELJKA.
I haven't seen him since MONDAY.

-Place

Trčim preko POLJA.
I run across the FIELD.

-Cause

Umreću od GLADI.
I'll die from HUNGER.

-Purpose

Ovo pišem zbog VAS.
I write this because of YOU.