Mój pokój był brudniejszy niż twój.

Breakdown of Mój pokój był brudniejszy niż twój.

być
to be
mój
my
twój
your
pokój
room
niż
than
brudny
dirty

Questions & Answers about Mój pokój był brudniejszy niż twój.

How do we form the word brudniejszy (dirtier) from the basic adjective brudny (dirty)?
To make regular adjectives comparative (like adding "-er" in English), you usually add the ending -szy or -ejszy. Because the root of brudny ends in a double consonant (-dn-), it takes -ejszy to make it easier to pronounce. We drop the original -y and add the new ending, resulting in brudniejszy.
Why does the comparative adjective end in -y (brudniejszy) here instead of -a or -e?
Adjectives in the comparative form still have to match the gender of the noun they describe. Since pokój (room) is a masculine noun, we use the masculine ending -y for the comparative form. If we were talking about a feminine noun like kuchnia (kitchen), it would be brudniejsza.
How does the word niż work in comparisons?
Niż translates to "than". It is very easy to use because it keeps the following word in the exact same case as the thing you are comparing it to. Since mój pokój is in the basic Nominative case, the word after niż (twój) is also in the Nominative case.
Why does the sentence just end with twój (your) instead of repeating pokój?
Just like in English where we say "yours" instead of repeating "your room", Polish allows you to drop the noun if it is already obvious from the context. The possessive pronoun twój acts as "yours" all on its own here.

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