Questions & Answers about Choć mój pokój jest mały, lubię w nim czytać.
Choć means although, though, or even though.
In this sentence, it introduces a contrast:
Choć mój pokój jest mały, lubię w nim czytać.
= Although my room is small, I like reading in it.
It is completely normal and natural in everyday Polish. A very close alternative is chociaż, which means the same thing. Choć is simply shorter.
Because pokój is a masculine singular noun, and the possessive adjective mój has to agree with it.
Polish adjectives and possessive words change to match the noun’s:
- gender
- number
- case
So:
- mój pokój = my room
- moja książka = my book
- moje okno = my window
Since pokój is masculine singular, mój is the correct form.