The 4th case (accusative) is used for the DIRECT OBJECT of a sentence.

Examples:

Sara ima lepega fanta. [ Sara has got a good-looking boyfriend. ]

Imam sestro. [ I've got a sister. ]

Pijejo kavo. [ They drink coffee. ]

The 4th case (accusative) is also used after the prepositions NA / V

when they express MOVEMENT TO a place.

Examples:

- Greš v kino? - Ne, grem na sprehod. [ - Are you going to the cinema? - No, I'm going for a walk. ]

Gremo v službo z vlakom. [ We go to work by train. ]

Hodim na univerzo. [ I go to university. ]

The 4th case (accusative) is also used after the preposition ZA when it means FOR, i.e. when it expresses PURPOSE.

Examples:

Potrebujemo moko za torto. [ We need flour for the cake. ]

Kupim darilo za Mateja. [ I'm buying a present for Matej. ]

The 4th case (accusative) is also used after some prepositions

(MED [ AMONG, BETWEEN ], PRED [ BEFORE, IN FRONT OF ], POD [ UNDER ], NAD [ OVER, ABOVE ]) when they come after a verb of MOVEMENT.

When the same prepositions come after a verb of LOCATION, they are followed by the 6th case (instrumental).