Vowel-Final Stems (ακούω, τρώω, λέω) | Greek Grammar

Greek irregularity almost always sits in the perfective stem and leaves the present alone. This little class is the honest exception: seven verbs whose stem ends in a vowel, and which are therefore odd in the present as well. They are not obscure — they are say, eat, hear, go, cry, burn and be-at-fault — so the oddity is in your mouth from the first week. This page takes the class as a whole: the present, the consonant that hides inside it, and the three different aorists it produces.

The seven verbs

Present	Meaning	2sg	Imperfect	Aorist	After θα / να
λέω	say, tell	λες	έλεγα	είπα	πω
τρώω	eat	τρως	έτρωγα	έφαγα	φάω
ακούω	hear, listen	ακούς	άκουγα	άκουσα	ακούσω
πάω	go	πας	πήγαινα	πήγα	πάω
κλαίω	cry	κλαις	έκλαιγα	έκλαψα	κλάψω
καίω	burn	καις	έκαιγα	έκαψα	κάψω
φταίω	be at fault	φταις	έφταιγα	έφταιξα	φταίξω

Read the columns and you can see the shape of the problem: the second column is one system, the fifth is three different ones, and the fourth has a letter in it that the first column does not.

The present: endings with the vowel squeezed out

A vowel-final stem cannot take the longer endings intact — λέ-εις, ακού-ουμε would stack up three vowels — so they arrive shortened. The pattern is completely regular within the class, which makes it worth learning as a block rather than verb by verb.

Person	λέω	τρώω	ακούω	κλαίω	πάω
εγώ	λέω	τρώω	ακούω	κλαίω	πάω
εσύ	λες	τρως	ακούς	κλαις	πας
αυτός/-ή/-ό	λέει	τρώει	ακούει	κλαίει	πάει
εμείς	λέμε	τρώμε	ακούμε	κλαίμε	πάμε
εσείς	λέτε	τρώτε	ακούτε	κλαίτε	πάτε
αυτοί/-ές/-ά	λένε	τρώνε	ακούν(ε)	κλαίνε	πάνε

Two things to fix in memory. The "you" form loses its vowel completely — λες, τρως, ακούς, κλαις, καις, φταις, πας — and the "we / you (pl) / they" forms take -με, -τε, -νε, not the -ουμε, -ετε, -ουν of γράφω. The system behind this, and how it relates to the Class Β contractions it resembles, is on contract verb details; here we simply need the forms.

Τι λες, φεύγουμε ή περιμένουμε άλλα δέκα λεπτά;

ti les, févghume i periménume ála dhéka leptá;

What do you reckon — shall we go, or wait another ten minutes?

Δεν ακούμε τίποτα από δω πίσω, μπορείς να μιλήσεις πιο δυνατά;

dhen akúme típota apó dho píso, borís na milísis pio dhinatá;

We can't hear anything back here — could you speak up a bit?

Τρώμε συνήθως γύρω στις εννιά, αλλά σήμερα πεινάσαμε νωρίς.

tróme siníthos yíro stis eniá, alá símera pinásame norís

We usually eat around nine, but today we got hungry early.

💡

Those "you" forms are monosyllables, so they carry no accent: λες, τρως, πας, κλαις, φταις — never ×λές or ×πάς. Only ακούς has two syllables and therefore a tonos. This is the ordinary monotonic rule (one accent per polysyllabic word, none on monosyllables), but these verbs are where learners break it most often, because the English ear hears a stressed word and reaches for a stress mark.

The γ that the present is hiding

Here is the key that unlocks the whole class. Step outside the present tense and a γ appears out of nowhere:

Present	Imperfect	Gerund	Mediopassive
λέω	έλεγα	λέγοντας	λέγομαι — be called
τρώω	έτρωγα	τρώγοντας	τρώγεται — is eaten
ακούω	άκουγα	ακούγοντας	ακούγεται — is heard
κλαίω	έκλαιγα	κλαίγοντας	—
καίω	έκαιγα	καίγοντας	καίγομαι — I'm burning
φταίω	έφταιγα	φταίγοντας	—

The history is worth two sentences, because it makes the pattern stick. λέω and τρώω genuinely had that γ: they were λέγω and τρώγω, and Greek dropped the γ between vowels in the present while leaving it standing everywhere else. ακούω, κλαίω, καίω and φταίω never had one — they acquired it by analogy, because speakers heard έλεγα and έτρωγα and levelled the rest of the class to match. Either way, the practical rule is the same and it has no exceptions inside the class: imperfect, gerund and mediopassive take the γ; the present does not.

Όλο το απόγευμα άκουγα τους γείτονες να μαλώνουν.

ólo to apóyevma ákugha tus yítones na malónun

I spent the whole afternoon listening to the neighbours arguing.

Έλεγα και ξανάλεγα το ίδιο πράγμα και κανείς δεν με άκουγε.

élegha ke ksanálegha to ídhio prághma ke kanís dhen me ákuye

I said the same thing over and over and nobody was listening to me.

Το τραγούδι ακούγεται σε κάθε ραδιόφωνο φέτος.

to traghúdhi akúyete se káthe radhiófono fétos

That song is on every radio station this year.

The gerund side of this is worked out on forming the gerund in -οντας; the imperfect side belongs with the imperfect of Class Α. What no other page can tell you is that they are the same γ, so you learn it once and it pays in three places.

πάω is the exception that proves the rule. It has no γ to restore, because it does not build an imperfect at all: the imperfective past comes from its twin πηγαίνω, giving πήγαινα (never ×έπαγα). Its full division of labour is on πάω / πηγαίνω.

Πήγαινα σχολείο με τα πόδια, δεν υπήρχε λεωφορείο τότε.

píyena scholío me ta pódhia, dhen ipírche leoforío tóte

I used to walk to school — there was no bus back then.

Three kinds of aorist in one small class

The seven verbs agree about the present and agree about the γ. About the aorist they split three ways, and telling the three apart is the difference between guessing and knowing.

Type	Verbs	What happens
Clean -σα	ακούω → άκουσα	the -σ- lands straight on the vowel, exactly as the rule predicts
Hidden consonant	κλαίω → έκλαψα, καίω → έκαψα, φταίω → έφταιξα	an old consonant buried in the -αι- surfaces and merges: -ψα, -ξα
Suppletive	λέω → είπα, τρώω → έφαγα, πάω → πήγα	a different root altogether; nothing of the present survives

💡

The class feels far more irregular than it is, because the three suppletive members — λέω, τρώω, πάω — are also the three you use most often. Set them aside as vocabulary and what remains is orderly: ακούω is a textbook regular verb, and κλαίω, καίω and φταίω are predictable the moment you know their buried consonant. Four of the seven cost you nothing once the pattern is in place.

Only the middle row is genuinely a vowel-stem phenomenon, and it is worked out in full on aorists of vowel-stem verbs. The bottom row is pure suppletion and lives with the six suppletive verbs. The top row is not irregular at all.

That top row has a practical consequence worth pausing on: because ακούω's two stems differ only by the -σ-, the aspect choice after θα and να is unusually easy to hear — θα ακούω (I'll be listening) against θα ακούσω (I'll listen, once). The perfective stem is doing exactly its normal job here.

Θα ακούσω τα μηνύματα μόλις βγω από τη σύσκεψη.

tha akúso ta minímata mólis vgho apó ti sískepsi

I'll listen to the messages as soon as I'm out of the meeting.

Το μωρό έκλαιγε όλη νύχτα και το πρωί έκλαψε και η μάνα του.

to moró ékleye óli níchta ke to proí éklapse ke i mána tu

The baby cried all night, and in the morning his mother cried too.

φταίω: a verb with no object at all

φταίω has no English counterpart as a verb — English says it's my fault with a noun. In Greek the fault is a verb, and the person at fault is its subject, which is why the sentence is so short: Εγώ φταίω. It takes no object. What it takes instead is either για + accusative (the thing that went wrong) or a που-clause (the fact that went wrong).

Δεν φταις εσύ που χάλασε το πλυντήριο.

dhen ftes esí pu chálase to plindírio

It's not your fault the washing machine broke.

Φταίει η κίνηση, όχι ο οδηγός — ξεκινήσαμε στην ώρα μας.

ftéi i kínisi, óchi o odhighós — ksekinísame stin óra mas

It's the traffic's fault, not the driver's — we set off on time.

καίω hides a similar trap. It is transitive ("burn something"), but its third person doubles as an ambient statement about the sun or the food, and its mediopassive καίγομαι is what you use for something that is burning on its own — including a person with a fever.

Πρόσεχε το τηγάνι, καίει πολύ το λάδι.

prósiche to tigháni, kéi polí to ládhi

Watch out for the pan — that oil is really hot.

Καίγεται το φαγητό, κλείσε το μάτι!

kéyete to fayitó, klíse to máti

The food's burning — turn the hob off!

The wider system these two belong to — an active that does something to an object beside a mediopassive that lets it happen by itself — is active/passive verb pairs.

Common Mistakes

1. Giving the "you" form its full ending. In this class the 2sg contracts to a bare -ς; the -εις of γράφεις has no place here.

❌ Τι λέεις για το Σάββατο;

Incorrect — the 2sg of λέω is λες.

✅ Τι λες για το Σάββατο, είσαι ελεύθερος;

ti les ya to Sávato, íse eléftheros;

What about Saturday — are you free?

2. Using the ordinary -ουμε in the "we" form. The class takes the short -με.

❌ Τρώουμε συνήθως έξω τα Σαββατοκύριακα.

Incorrect — the 1pl of τρώω is τρώμε.

✅ Τρώμε συνήθως έξω τα Σαββατοκύριακα.

tróme siníthos ékso ta savatokíriaka

We usually eat out at weekends.

3. Building the imperfect off the present, without the γ. The present is the one place the γ is missing; the past puts it back.

❌ Δεν σε άκουα καθόλου με τον θόρυβο της μηχανής.

Incorrect — the imperfect of ακούω restores the γ: άκουγα.

✅ Δεν σε άκουγα καθόλου με τον θόρυβο της μηχανής.

dhen se ákugha kathólu me ton thórivo tis michanís

I couldn't hear you at all over the noise of the bike.

4. Putting an accent on the monosyllabic 2sg. πας, λες, τρως and κλαις are single syllables and take no tonos.

❌ Πάς συχνά στο χωριό σου;

Incorrect — πας is a monosyllable and takes no accent.

✅ Πας συχνά στο χωριό σου το καλοκαίρι;

pas sichná sto chorió su to kalokéri;

Do you go to your village often in the summer?

Key Takeaways

Seven verbs have a vowel-final stem: λέω, τρώω, ακούω, πάω, κλαίω, καίω, φταίω. They are irregular in the present, which most Greek irregular verbs are not.
The present takes shortened endings: 2sg with no vowel at all (λες, τρως, ακούς, κλαις, πας) and -με / -τε / -νε in the plural.
Those 2sg forms are monosyllables and take no tonos — λες, τρως, πας, κλαις, φταις; only ακούς has an accent.
A γ resurfaces outside the present: imperfect (έλεγα, άκουγα, έκλαιγα), gerund (λέγοντας, ακούγοντας) and mediopassive (λέγομαι, ακούγεται, καίγομαι). λέω and τρώω inherited it; the rest acquired it by analogy.
πάω has no γ and no imperfect of its own — it borrows πήγαινα from πηγαίνω.
The aorist splits three ways: clean (άκουσα), hidden consonant (έκλαψα, έκαψα, έφταιξα) and suppletive (είπα, έφαγα, πήγα).
φταίω takes no object: the person at fault is the subject (Εγώ φταίω), and the rest goes on για or a που-clause.

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