Questions & Answers about To mój zięć, od którego dostałem ten prezent.
Why is the relative pronoun in the form którego?
It refers back to zięć (son-in-law), which is masculine. The preposition od (from) always forces the following word into the Genitive case. The masculine Genitive form of który is którego.
Can I put the preposition at the end of the sentence like in English: 'who I got this present from'?
No, Polish strictly forbids leaving a preposition at the end of a clause. The preposition od must stay right next to the pronoun it connects with, which is why we must say od którego (from whom).
How do we know the person speaking is a man?
Why didn't ten prezent change its ending? Doesn't the verb dostać change the object's case?
It does! The verb dostać requires the Accusative case. However, prezent is a masculine inanimate noun. For inanimate objects in the masculine gender, the Accusative form looks exactly the same as the basic dictionary form, so it stays ten prezent.