Time, Cause, Topic: o, po, pri, pre, cez, vďaka

Each of these prepositions always takes the same case:

• o + locative (about): o filme, o láske
• po + locative (after): po obede, po večeri
• pri + locative (by, near; while): pri jazere, pri jedle
• pre + accusative (for): pre manželku, pre brata
• cez + accusative (during; through, across): cez zimu, cez rieku
• vďaka (thanks to) and kvôli (because of) + dative: vďaka kamarátke, kvôli dažďu

Locative usually ends in -e or -i (o žene, o ulici). Masculine and neuter nouns ending in k, g, h, ch take -u (o parku, o jablku). Accusative: feminine -a becomes -u, masculine animate nouns add -a. Dative: feminine -e/-i, masculine inanimate -u, masculine animate -ovi (vďaka učiteľovi).