The Greek Verb System: Overview

The verb is where Greek is at its most different from English, and also where it is most systematic. An English form such as write leaves person, number, time and mood largely to its surroundings. A finite Greek verb packs much of that information into its ending and stem: who acts, when, whether the action is viewed internally or as bounded, its voice, and whether it is a statement, wish, or command. This page maps that system and points to the detailed pages.

Five dimensions in a finite Greek verb

The rest of the Verbs section is really just these five columns explored one at a time. Two of them — aspect and the absence of an infinitive — have no clean English equivalent, so they deserve to be flagged before anything else.

Shock one: there is no productive infinitive for “to + verb”

English has a base form after to and other verbs: I want *to go, I can swim, it's time to eat*. Modern Greek has no productive infinitive that can fill this slot. Instead, it uses να + a fully conjugated verb that agrees with its own subject.

Literally these say "I want that I go" and "I can't that I come." The verb after να is inflected: θέλω να πάω "I want to go" but θέλω να πας "I want you to go." A small invariant form traditionally called απαρέμφατο survives inside έχω perfect constructions, but it cannot replace English to go; see The invariant perfect form. The historical replacement is covered in The loss of the infinitive, and να-clauses in the subjunctive overview.

Shock two: aspect organizes the core paradigms

This is the single hardest and most important thing about the Greek verb. Most productive verbs contrast an imperfective stem, which presents an action internally or as an open habit, with a perfective stem, which packages an occurrence or a finite series as a bounded whole. For γράφω these are γράφ- and γράψ-. Irregular verbs may build a suppletive pair, while one-stem and defective verbs may lack a visible member of the contrast.

The point that trips up every English speaker: this is not just a past-tense thing. The imperfective/perfective choice runs through the past, the future, the subjunctive and the imperative alike.

Both are future, both are "I will write," but Greek makes you choose a viewpoint and a stem. Event count is not the rule: one event can be viewed from inside, while a limited repeated series can be bounded. English sometimes distinguishes "I was writing" from "I wrote", but Greek carries the contrast across the past, future, subjunctive and imperative. See Aspect: the heart of the Greek verb and The two verb stems.

The two conjugations

Most verbs with an active present belong to one of two broad conjugation classes, and you tell them apart by the stress on the active "I" form (1st person singular). Mediopassive-only and highly irregular paradigms must be learned from their own citation forms.

• Class Α (πρώτη συζυγία) ends in unstressed -ω: γράφω, παίζω, τρέχω, διαβάζω. This is the big, regular class.
• Class Β (δεύτερη συζυγία) ends in stressed -άω/-ώ: αγαπώ, μιλάω, μπορώ. Its endings pull the accent onto themselves.

That stress difference — γράφω vs αγαπώ — diagnoses the present-tense class and predicts many endings, though principal parts still have to be learned. The two conjugations sets them side by side, and Class Β splits into sub-patterns (αγαπάω vs μπορώ) on Class Β subtypes.

Voice: doing versus undergoing

Greek has two voices. The active looks like γράφω, τρέχω, θέλω. The mediopassive (μεσοπαθητική) has a completely different set of endings — -ομαι, -εσαι, -εται… — and covers the English passive ("it is done"), reflexive and reciprocal meanings, and a large group of everyday verbs that simply only exist in this form.

In current Standard Greek, έρχομαι has no corresponding active form; facts like this must be learned with the verb. The endings are on Mediopassive personal endings; the system starts at Voice: an overview.

Mood: statement, wish, command

• Indicative — plain statements and questions: γράφεις "you write / you're writing."
• Subjunctive — introduced by να or ας, for wishes, purposes, and many clauses under another verb: θέλω να γράψεις "I want you to write."
• Imperative — direct commands: γράψε! "write!"

The future is indicative: θα γράψεις contains θα, not a subjunctive introduced by θα. Conversely, a να-clause does not add θα.

Notice how mood and aspect interlock: the command γράψε uses the perfective stem because the requested message is framed as bounded. The accompanying να ξέρω is a one-stem stative and does not offer the same stem contrast. Mood is mapped at Mood: an overview.

Why Greek can drop the subject

Because the ending already spells out person and number, the subject pronoun is normally left out. Γράφω is unambiguously "I write"; adding εγώ usually does discourse work such as emphasis, contrast, or a topic shift. This is why the personal endings are the highest-value thing to memorise early: they are the pronouns, baked into the verb. See Active personal endings and, for when a pronoun is actually needed, Using subject pronouns.

Common Mistakes

1. Inventing an infinitive after another verb. In the English want to go pattern, use να + a conjugated verb, not inline ×θέλω πηγαίνω.

2. Treating subject pronouns as obligatory. The ending already carries the person; use a pronoun for emphasis or contrast.

3. Stressing a Class Β verb like a Class Α one. The whole point of Class Β is that the stress sits on the ending.

4. Letting event count choose aspect. One future event can be viewed internally, while a result can be framed as bounded.

Where to go next

• Foundations: the two conjugations, Class Β subtypes, aspect, the two stems, and active versus mediopassive endings.
• Tense and aspect: the tense map, present, future, imperfect, aorist, and perfect.
• Mood and voice: subjunctive, imperative, voice, deponents, and modal particles.
• Lookup: irregular verbs and the verb reference.

Key Takeaways

• A finite Greek verb form can encode five dimensions at once: person/number, tense, aspect, voice, and mood.
• There is no productive infinitive for English “to + verb”: use να + a conjugated verb (θέλω να πάω). The invariant perfect form is a separate restricted survival.
• Aspect is the spine: in most productive verbs, imperfective gives an internal/open view and perfective packages an occurrence or finite series as bounded across the past, future, subjunctive and imperative; one-stem and defective verbs may not display both forms.
• Verbs come in two conjugations, told apart by the stress on the 1sg: unstressed -ω (γράφω) vs stressed -άω/-ώ (αγαπώ).
• Two voices (active, mediopassive) with two entirely different ending sets; some verbs live only in the mediopassive.
• The ending carries person and number, so subject pronouns are dropped by default.