"Which book do you want?"
Translation:Kterou knihu chcete?
In the sentence "Které jablko chcete?" the word "jablko" is also in the accusative (The pattern "město" [jablko] has identical ending in the nominative and the accusative, while the pattern "žena" [kniha] does not). There is one thing in the nominative in this sentence and it is the subject "vy" (which is hidden).