You have met individual nouns whose accent seems to hop around: ο άνθρωπος but του ανθρώπου, το αυτοκίνητο but του αυτοκινήτου. This is not chaos and it is not per-word memorisation — it is one rule, applied consistently across the whole noun system. Getting it right is what separates writing that reads as native from writing that a Greek reader stumbles over, because a misplaced accent is as jarring to them as a misspelling is to us. This page takes the general three-syllable law and works it through declension, gender by gender, so you can predict every shift.
The rule in one sentence
The stress of a Greek word may never fall earlier than the third syllable from the end (the antepenult). When you decline a noun, the ending can change the "back end" of the word — and if that pushes the existing accent past the antepenult, the accent is forced to slide forward to stay legal.
Only proparoxytone nouns — those already stressed on the third-from-last syllable in the nominative — are candidates for shifting, because they are the only ones sitting right at the edge of the window. Oxytone (last-syllable) and paroxytone (next-to-last) nouns have room to spare and never move.
Masculine -ος: the genitive and the accusative plural move
Take ο άνθρωπος (proparoxytone — stress on the first of three syllables, ά-νθρω-πος). The genitive singular -ου, the genitive plural -ων, and the accusative plural -ους are all historically heavy, so they force the accent one syllable forward. Everywhere else it stays put.
| Case | Singular | Plural |
|---|---|---|
| Nominative | ο άνθρωπος | οι άνθρωποι |
| Genitive | του ανθρώπου (shift →) | των ανθρώπων (shift →) |
| Accusative | τον άνθρωπο | τους ανθρώπους (shift →) |
| Vocative | άνθρωπε | άνθρωποι |
Read the accent hop down the paradigm: άνθρωπος → ανθρώπου → ανθρώπων → ανθρώπους. The same happens to every antepenult-stressed -ος noun — ο δάσκαλος → του δασκάλου, ο ήλιος → του ηλίου.
Η γνώμη του δασκάλου μετράει πολύ για μένα.
i ghnómi tu dhaskálu metrái polí ya ména
The teacher's opinion matters a lot to me.
Οι ζωές των ανθρώπων άλλαξαν μετά την πανδημία.
i zoés ton anthrópon álaksan metá tin pandhimía
People's lives changed after the pandemic.
Compare a paroxytone (ο φίλος) and an oxytone (ο ουρανός): neither has any spare distance to lose, so the accent is glued in place through the whole paradigm — του φίλου, του ουρανού, never ×του φιλού or ×του ούρανου.
Το όνομα του φίλου μου είναι Αλέξης.
to ónoma tu fílu mu íne Aléksis
My friend's name is Alexis.
Το χρώμα του ουρανού είναι υπέροχο απόψε.
to chróma tu uranú íne ipérocho apópse
The colour of the sky is gorgeous tonight.
Neuter -ο: the genitive moves, the plural doesn't
Neuters in -ο are the cleanest illustration, because the nominative/accusative plural ending -α is not heavy — it swaps one final vowel for another without lengthening the word — so the plural keeps the accent where it is. Only the genitive -ου / -ων shifts it. Take το αυτοκίνητο (αυτοκίνητο, five syllables, stressed on the antepenult κί):
| Case | Singular | Plural |
|---|---|---|
| Nominative | το αυτοκίνητο | τα αυτοκίνητα |
| Genitive | του αυτοκινήτου (shift →) | των αυτοκινήτων (shift →) |
| Accusative | το αυτοκίνητο | τα αυτοκίνητα |
So αυτοκίνητο, τα αυτοκίνητα (accent home) but του αυτοκινήτου, των αυτοκινήτων (accent shifted). The same pattern governs το πρόσωπο → των προσώπων, το σίδερο → του σιδέρου.
Το κλειδί του αυτοκινήτου έμεινε μέσα.
to klidhí tu aftokinítu émine mésa
The car key got left inside.
Η τιμή των αυτοκινήτων ανέβηκε φέτος.
i timí ton aftokiníton anévike fétos
The price of cars went up this year.
(The neuter -μα class — μάθημα → μαθήματα — also shifts, but there the trigger is a genuinely added syllable in the plural. That interacts with the genitive -ματος too; the details are on the genitive singular page.)
Feminine learned nouns: the whole plural shifts
The learned feminines in -η — η κυβέρνηση, η δύναμη, η απόφαση — are the boldest movers. Their plural formant -εις / -εων inherited the Ancient accent, so the stress moves forward in every plural form, not just the genitive. Take η κυβέρνηση (proparoxytone, κυβέρνηση):
| Case | Singular | Plural |
|---|---|---|
| Nominative | η κυβέρνηση | οι κυβερνήσεις (shift →) |
| Genitive | της κυβέρνησης | των κυβερνήσεων (shift →) |
| Accusative | την κυβέρνηση | τις κυβερνήσεις (shift →) |
Notice the singular keeps the accent home (της κυβέρνησης — legal, still antepenult), but the whole plural moves it to the penult: οι κυβερνήσεις, των κυβερνήσεων, τις κυβερνήσεις. Likewise η δύναμη → οι δυνάμεις, η απόφαση → οι αποφάσεις.
Οι αποφάσεις των κυβερνήσεων επηρεάζουν τους πάντες.
i apofásis ton kiverníseon epireázun tus pándes
Governments' decisions affect everyone.
Who shifts and who doesn't
| Nominative accent | Example | Shifts in declension? |
|---|---|---|
| Oxytone (last syllable) | ο ουρανός, η αυγή | No — accent already at the end |
| Paroxytone (next-to-last) | ο φίλος, η μέρα | No — always legal |
| Proparoxytone (third-from-last) | ο άνθρωπος, το αυτοκίνητο, η κυβέρνηση | Yes — in the "heavy" cells |
The practical drill: say the nominative and count back to the accent. If it lands on the third syllable from the end, expect a shift in the genitive (both numbers), the masculine accusative plural, and the whole learned-feminine plural. If it lands on the last two, nothing moves.
Common Mistakes
1. Keeping a proparoxytone's accent in the masculine genitive. The stress must move forward.
❌ Το όνειρο του άνθρωπου ήταν να ταξιδέψει.
Incorrect — the genitive is ανθρώπου, with the accent shifted forward.
✅ Το όνειρο του ανθρώπου ήταν να ταξιδέψει.
to óniro tu anthrópu ítan na taksidhépsi
The man's dream was to travel.
2. Keeping the accent home in a neuter genitive. το αυτοκίνητο → του αυτοκινήτου.
❌ Η πόρτα του αυτοκίνητου κόλλησε.
Incorrect — the genitive shifts: αυτοκινήτου.
✅ Η πόρτα του αυτοκινήτου κόλλησε.
i pórta tu aftokinítu kólise
The car door got stuck.
3. Forgetting the shift across the learned-feminine plural. The stress moves in every plural cell.
❌ Οι αποφάσεις των κυβέρνησεων ήταν σκληρές.
Incorrect — the genitive plural is κυβερνήσεων, with the accent on the penult.
✅ Οι αποφάσεις των κυβερνήσεων ήταν σκληρές.
i apofásis ton kiverníseon ítan sklirés
The governments' decisions were harsh.
4. "Shifting" a paroxytone that should stay put. Only proparoxytones move; ο φίλος keeps its accent.
❌ Το ποδήλατο του φιλού μου χάλασε.
Incorrect — φίλος is paroxytone, so the genitive stays φίλου.
✅ Το ποδήλατο του φίλου μου χάλασε.
to podhílato tu fílu mu chálase
My friend's bike broke down.
Key Takeaways
- The accent may never sit earlier than the third syllable from the end; when an ending threatens that, the accent slides forward.
- Only proparoxytone nouns shift. Oxytone and paroxytone nouns never move.
- Masculine -ος: shifts in the genitive singular, genitive plural, and accusative plural (άνθρωπος → ανθρώπου / ανθρώπων / ανθρώπους).
- Neuter -ο: shifts only in the genitive (αυτοκίνητο → αυτοκινήτου / αυτοκινήτων); the -α plural stays home.
- Learned feminine -η: shifts across the entire plural (κυβέρνηση → κυβερνήσεις / κυβερνήσεων).
- When in doubt, count back to the accent: third syllable → watch for a shift; last two → nothing moves.
Now practice Greek
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Start learning Greek→Related Topics
- Where the Stress FallsA2 — Greek stress is unpredictable but not lawless: it must land within the last three syllables. When an ending adds a syllable, the accent is forced to move forward — άνθρωπος but του ανθρώπου, μάθημα but μαθήματα.
- The Genitive Plural (-ων)B1 — The plural 'of the…' form ends in -ων for almost every Greek noun (των ανθρώπων, των παιδιών, των πόλεων→-εων), and the article is always των — but the stress is the trickiest in the language, so natives often sidestep the awkward ones with από + accusative.