Questions & Answers about Mój plecak jest cięższy niż twoja torba.
Because adjectives and possessive words in Polish must agree with the noun’s gender, number, and case.
- plecak (backpack) is masculine singular, so you use mój = my
- torba (bag) is feminine singular, so you use twoja = your
That is why the sentence has:
- mój plecak
- twoja torba
Other forms of my include, for example:
- moja for feminine singular
- moje for neuter singular
Because cięższy is the comparative form of ciężki (heavy).
- ciężki = heavy
- cięższy = heavier
The sentence is making a comparison, so Polish uses the comparative form, just like English uses heavier instead of heavy.
Also, cięższy agrees with plecak, which is masculine singular.