Wracam na taras, na którym zostawiłem książkę.

Questions & Answers about Wracam na taras, na którym zostawiłem książkę.

Why do we use którym here?
Którym is the Locative form of który (which). It is in the Locative case because it follows the preposition na describing a static location (on which). It takes the masculine form to match the noun it refers back to, which is taras (terrace).
The sentence uses na taras and then na którym. Why doesn't taras change its ending after na?
The first na describes motion (returning to the terrace), so it requires the Accusative case. For masculine inanimate nouns like taras, the Accusative looks exactly like the basic dictionary form. The second na describes a static location (on which I left it), which requires the Locative case, hence na którym.
If a woman is speaking, how would the sentence change?
She would say zostawiłam. The verb zostawiłem is in the masculine past tense (I left). A female speaker changes the -łem ending to -łam. The rest of the sentence, including na którym, stays exactly the same because którym refers to the masculine noun taras, not the speaker.
Why is the word for book written as książkę?
It is in the Accusative case because it is the direct object of the verb zostawiłem (I left). Feminine nouns that end in -a like książka change their ending to in the Accusative case.

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