Questions & Answers about Η κυριότητα είναι ξεκάθαρη.
Η is the definite article for a feminine singular noun in the nominative case.
Here it matches κυριότητα, which is feminine singular. Greek uses articles much more regularly than English, even with abstract nouns, so Η κυριότητα is perfectly natural.
It is in the nominative singular.
You can tell because it is the subject of the sentence: it is the thing that is something. In Η κυριότητα είναι ξεκάθαρη, the subject is Η κυριότητα, so nominative is the expected case.
Κυριότητα is feminine.
That matters because in Greek, adjectives usually agree with the noun they describe in:
- gender
- number
- case
So because κυριότητα is feminine singular nominative, the adjective appears as ξεκάθαρη, which is also feminine singular nominative.