How to translate "the"

Definite articles change following gender, number and case.

For each gender below, the 1st column is the singular. The 2nd is the plural. Then the lines give nominative, genitive and accusative.

Masculine

ο οι (Nominative)

του των (Genitive)

το(ν) τους (Accusative)

Feminine

η οι

της των

τη(ν) τις

Neutral

το τα

του των

το τα

There is no article for vocative.

OK. This is not a big deal as we already have 18 definite articles here.