Verb Accentuation

Learners often file Greek verb stress under "just memorise each form," but it is one of the most rule-governed parts of the language. Almost all of it follows a single principle — verb stress is recessive, meaning it retreats as far back toward the start of the word as the rules permit. Once you see that principle at work, a whole crowd of "irregular"-looking stresses (why γράφω but γράφουμε, why έγραψα grows an ε-, why αγαπώ but αγάπησα) turn out to be the same thing.

The three-syllable law, in one line

Greek has one hard ceiling on where a word may be stressed: never further back than the third syllable from the end (the antepenult). This "law of limitation" governs nouns and verbs alike — it is the same principle behind the noun accent shift, and the general version lives on stress rules. For verbs, the law is not just a ceiling; it is a magnet. The stress wants to sit as far back as the law allows.

Recessive stress in the present

Take γράφω. The stress lands on the stem syllable γρά and stays glued there as endings are added — always retreating to the furthest-back legal syllable, which is the antepenult once the word is long enough.

The stress never actually moves off γρά here; it only looks like it shifts because in γράφουμε that same syllable happens to be the antepenult. The tonos in writing simply tracks the spoken stress.

The past: recessive stress meets the augment

Past tenses (imperfect and aorist) pull the stress onto the antepenult. In a short verb the stem doesn't reach that far back, so the past grows a prefixed ε- purely to host the stress: γράφω → έγραφα, έγραψα. This is the whole reason the augment exists — the story is told in full on the augment overview.

The reverse also follows from the law. Once the ending itself makes the word long enough, the antepenult is already available inside the stem, and the augment isn't needed — so γράφαμε and γράφατε have no ε-.

Class Β: the exception that proves the rule

Not every present is recessive. The -άω/-ώ verbs of Class Β (αγαπώ, μιλάω, μπορώ) stress the ending in the present — they are historically contracted verbs, and the stress is locked onto the contracted syllable. So the present goes against the recessive default: αγαπώ, αγαπάς, αγαπά, αγαπάμε.

But watch what happens in the past. The aorist of αγαπώ is αγάπησα — the stress snaps back to the antepenult, exactly as recessive stress predicts. So Class Β is only an exception in the present; in the aorist it rejoins the recessive crowd. The two conjugations are introduced on the two conjugations, and the aorist stress in detail on the aorist accent.

Mediopassive forms: the same magnet, a heavier ending

Two different things happen in the mediopassive, and it is worth keeping them apart. In the present, recession works exactly as before: γράφομαι stresses the antepenult γρά, and when the ending grows a syllable in the 1st plural γραφόμαστε (γρα-φό-μα-στε, four syllables), the three-syllable law pulls the stress forward one step, onto -φό-. That is pure recession — the same magnet, a longer word.

The past singular is a different story. Its endings -όμουν, -όσουν, -όταν carry their own fixed stress, so κοιμόμουν and γραφόμουν are stressed on the penult not because the stress retreated there but because the ending demands it. The proof is the 3rd person plural, whose ending -ονταν carries no stress of its own: there the stress falls back onto the stem exactly as recession predicts — έρχονταν, not ×ερχόνταν. So the past singular is lexically accented on the ending, while the plural is recessive; two rules, side by side in one paradigm.

Why this is worth the effort

English stress is famously unpredictable (PHOtograph, phoTOgrapher, photoGRAPHic) and you learn it word by word. Greek verb stress is the opposite: it is a system. If a form's stress surprises you, the answer is almost never "it's irregular" — it's "the recessive magnet pulled it to the antepenult, and here's what got in the way." That single insight demystifies the augment, the Class Β past, and the mediopassive shifts all at once.

Common Mistakes

1. Leaving the stress on the stem when an ending makes the word longer. In γράφουμε the stress is on the antepenult γρά, not the ending.

2. Keeping the Class Β end-stress in the aorist. The past pulls the stress back to the antepenult.

3. Adding an augment to a form that already reaches the antepenult. If the stress can land three syllables back on its own, no ε-.

Key Takeaways

• Greek verb stress is recessive: it retreats to the furthest-back legal syllable, capped at the antepenult (the three-syllable law).
• The stress on γράφω only seems to move in γράφουμε — it stays on γρά, which becomes the antepenult.
• The augment exists to give short past forms an antepenult to sit on (έγραψα); longer forms don't need it.
• Class Β stresses the ending in the present (αγαπώ) but pulls back to the antepenult in the aorist (αγάπησα) — the recessive default reasserts itself.