Questions & Answers about Η πέτρα είναι βαριά.
Η is the feminine singular form of the definite article, so here it means the.
In this sentence:
- Η πέτρα = the stone
Greek articles change for gender, number, and case. Here πέτρα is a feminine singular noun, so it takes η.
In Greek, grammatical gender is not the same thing as real-world sex.
πέτρα is a grammatically feminine noun, so words that go with it, such as the article and adjective, must also be feminine. This does not mean the stone is female in any literal sense.
So:
- η matches the feminine noun πέτρα
- βαριά also matches it because adjectives agree with the noun
Greek adjectives must agree with the noun they describe in:
- gender
- number
- case
Since πέτρα is feminine singular nominative, the adjective must also be feminine singular nominative.
So the forms are:
- masculine: βαρύς
- feminine: βαριά
- neuter: βαρύ
That is why the sentence uses βαριά.