Questions & Answers about Kategorija je teška.
Je is the 3rd person singular present tense of biti (to be).
So:
- kategorija = category
- je = is
- teška = difficult / hard
So the structure is simply:
Kategorija je teška. = The category is difficult.
In Croatian, je is a very common short form and is usually unstressed.
In Croatian, nouns have grammatical gender: masculine, feminine, or neuter.
Kategorija is feminine, and one strong clue is that it ends in -a, which is very common for feminine nouns.
Because the noun is feminine, any adjective describing it must also be feminine:
- masculine: težak
- feminine: teška
- neuter: teško
So kategorija requires teška, not težak.