Questions & Answers about Kamen je težak.
Croatian does not have articles like English the and a/an.
So kamen can mean:
- a stone
- the stone
- sometimes just stone, depending on context
You understand which one is meant from the situation, not from an article.
Je means is.
It is the 3rd person singular present tense of the verb biti = to be.
So:
- ja sam = I am
- ti si = you are
- on/ona/ono je = he/she/it is
In Kamen je težak, je links the subject kamen with the description težak.