Choose the correct accusative form — the case of the direct object and of direction after u and na.
Masculine inanimate: grad → grad (= nominative) · Masculine animate: pas → psa (= genitive!) · Feminine: žena → ženu · Neuter: selo → selo (= nominative).
The classic trap: for people and animals the accusative copies the genitive — Čekam brata, not *Čekam brat*. After u / na, accusative answers where to? (Idem u školu) while locative answers where?