Learn Polish: To powieść, którą mi poleciłeś. - This is the novel that you recommended to me.

Którą is the accusative (direct object) form of the relative pronoun który. It matches the feminine noun powieść (novel). We use the accusative case here because the novel is the thing that was recommended, making it the direct object of the verb poleciłeś.

Wait, powieść ends in a consonant. Why does it take the feminine pronoun którą?

While most Polish feminine nouns end in -a, there is a special group of feminine words that end in a consonant, such as powieść (novel), noc (night), and rzecz (thing). Because powieść is feminine, any adjectives or pronouns replacing it must take feminine forms like którą.

The verb is poleciłeś. What if I am talking to a woman?

Poleciłeś is the masculine past tense form, meaning the person you are talking to (the one who recommended the novel) is a man. If you are speaking to a woman, you need to use the feminine past tense form: poleciłaś.

Why is mi placed before the verb instead of at the end of the sentence?

Mi is a short form pronoun meaning to me. In Polish, short pronouns avoid being the very last word in a sentence because they do not carry voice stress. Placing it right before the verb sounds much more natural than putting it at the end.