Questions & Answers about Η συλλογή είναι μεγάλη.
It is a simple subject + verb + adjective sentence:
- Η συλλογή = the subject
- είναι = the verb to be
- μεγάλη = an adjective describing the subject
So grammatically, it works very much like English The collection is large.
Because συλλογή is a feminine singular noun, and the Greek definite article has to match it.
In the nominative singular:
- ο = masculine
- η = feminine
- το = neuter
So Greek says η συλλογή because συλλογή is feminine.
Because grammatical gender in Greek is part of the noun itself. You learn the noun together with its article:
- η συλλογή
That tells you the noun is feminine. There is not always a logical reason why a thing is masculine, feminine, or neuter; it is just part of the word. That said, many nouns ending in -ή are feminine, so συλλογή fits a common pattern.