Questions & Answers about Το κάστρο είναι πολύ παλιό.
Το is the definite article, meaning the.
Greek articles change depending on the gender, number, and case of the noun.
Here, κάστρο is a neuter singular noun, so the correct article is το.
So:
- το κάστρο = the castle
Κάστρο is neuter.
One clue is its ending: many Greek neuter nouns in the singular end in -ο or -ι, though you should not rely on endings alone in every case.
Here are the forms of the castle in the singular:
- το κάστρο = nominative / accusative
- του κάστρου = genitive
So in this sentence, κάστρο is neuter singular nominative because it is the subject.