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Thematic and Non-Thematic Forms

In some tenses of both -ω and -μι verbs the endings are attached to the stem or theme by means of a connecting vowel which may be called the thematic vowel. This vowel is ο (ω in the subjunctive) before μ and ν, and ε (η in the subjunctive) in other situations. Verbs thus formed are said to belong to the thematic inflection; while all verbforms which lack this vowel “ο”/“ε” or “ω”/“η” are said to be of the non-thematic inflection. E. g.

Thematic: “λυ_-σό-μενος, δέχ-ε-σθαι, ἄγειν” (“ἀγε” + “εν”), “ἕλ-ω-μαι”.

Non-thematic: “λέλυ-ται, ἱστά-μενος, ἔστη, ἐλυ?-σα-ο”.

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