Columbia subject headings:
Greek language--Aspect.
Greek language--Tense.
Greek language--Verb.
Plato--Language.
Harvard subject headings:
Greek language--Aspect.
Greek language--Tense.
Greek language--Verb.
Plato--Language.
Princeton subject headings:
Greek language--Aspect.
Greek language--Tense.
Greek language--Verb.
Plato--Language.