Irregular Perfective Stems | Greek Grammar

Most verbs build their perfective stem by the tidy -σ- rule. A small set of verbs refuses. Instead of adding a suffix, they swap in a completely different stem — the way English go borrows went, or be borrows was. This is called suppletion, and it is not random which verbs do it: it is precisely the ones you use every hour of every day. That is annoying and reassuring at once — annoying because you can't derive the forms, reassuring because there are only about a dozen and you will meet them so often that they stick fast.

Why the everyday verbs are the broken ones

Irregularity survives where frequency protects it. A rare verb gets regularised over the centuries because nobody remembers its odd forms; a verb you say a hundred times a day keeps its ancient shape because everybody does. So Greek, like English, concentrates its suppletion in see, say, eat, go, take, find, give, drink, come in, go out, stay, leave. The payoff is that memorising this page buys you fluency in the exact verbs conversation is built from.

Crucially, the system is untouched. Each of these verbs still has exactly two stems — one imperfective (the present) and one perfective — feeding the same forms as every other verb. Only the shape of the perfective stem is unpredictable, never the architecture. So βλέπω "see" simply has δ- where a regular verb would have a -σ- stem, and δ- then does all four perfective jobs: θα δω, να δω, είδα, δες!

The core list

Learn each as a three-way pair: present → bare perfective (the θα/να form) → aorist (I did it).

Present	Meaning	Perfective (θα / να …)	Aorist (1sg)
βλέπω	see	δω	είδα
λέω	say, tell	πω	είπα
τρώω	eat	φάω	έφαγα
πηγαίνω / πάω	go	πάω	πήγα
παίρνω	take, get	πάρω	πήρα
βρίσκω	find	βρω	βρήκα
μπαίνω	go/come in	μπω	μπήκα
βγαίνω	go/come out	βγω	βγήκα
δίνω	give	δώσω	έδωσα
μένω	stay, live	μείνω	έμεινα
πίνω	drink	πιω	ήπια
φεύγω	leave	φύγω	έφυγα

The one-syllable "dependents"

Look at the middle column: δω, πω, βρω, μπω, βγω, πιω, φάω, πάω. Several of the perfective forms shrink to a single syllable. These are the purest example of what the two-stems page calls the dependent form — a stem so bare it cannot stand alone. βρω is not a sentence and does not mean "I find"; it only lives leaning on θα, να, or an equivalent particle.

Δεν μπορώ να βρω τα κλειδιά μου πουθενά.

dhen boró na vro ta klidhiá mu puthená

I can't find my keys anywhere.

Θέλω να δω τι θα γίνει στο τέλος της ταινίας.

thélo na dho ti tha yíni sto télos tis tenías

I want to see what happens at the end of the film.

Θα σου πω ένα μυστικό, αλλά μην το πεις πουθενά.

tha su po éna mistikó, alá min to pis puthená

I'll tell you a secret, but don't tell anyone. (πω after θα, πεις after μην)

Κάνε λίγο στην άκρη να μπω κι εγώ.

káne lígho stin ákri na bo ki eghó

Shift over a bit so I can get in too.

These bare perfectives pair with a distinctive -ηκα aorist for the motion verbs: βρήκα, μπήκα, βγήκα (found, went in, went out). The others form είδα, είπα, ήπια, έφαγα, πήγα, πήρα — each with its own irregular past that you simply learn.

Είδα μια πολύ καλή ταινία χθες το βράδυ.

ídha mia polí kalí tenía chthes to vrádhi

I saw a really good film last night.

Βγήκαμε για φαγητό με τους παλιούς μου συμμαθητές.

vyíkame ya fayitó me tus paliús mu simathités

We went out to eat with my old classmates.

Ήπια δυο καφέδες και τώρα δεν με πιάνει ύπνος.

ípia dhio kafédhes ke tóra dhen me piáni ípnos

I drank two coffees and now I can't get to sleep.

The vowel-swap verbs

A second group keeps most of the stem but changes a vowel — no -σ- suffix in some cases, an unexpected one in others:

δίνω → δώσω (έδωσα): keeps a -σ-, but the ι becomes ω. "give."
μένω → μείνω (έμεινα): no -σ- at all; the ε becomes ει. "stay, live."
παίρνω → πάρω (πήρα): the -ρν- of the present collapses to -ρ-. "take, get."
φεύγω → φύγω (έφυγα): the ευ of the present becomes υ. "leave."

Πήγα στον γιατρό και μου έδωσε κάτι φάρμακα.

pígha ston yatró ke mu édhose káti fármaka

I went to the doctor and he gave me some medicine. (πήγα + έδωσε)

Πήρα το λεωφορείο γιατί χάλασε το αμάξι.

píra to leoforío yatí chálase to amáksi

I took the bus because the car broke down.

Έμεινα σπίτι όλο το Σαββατοκύριακο με κρύωμα.

émina spíti ólo to savatokíriako me kríoma

I stayed home all weekend with a cold.

Έφυγα νωρίς από τη δουλειά για να προλάβω τον γιατρό.

éfigha norís apó ti dhuliá ya na prolávo ton yatró

I left work early to make my doctor's appointment.

💡

These twelve verbs also have the most irregular imperatives in the language — δες / πες / πάρε / βρες / φάε / μπες / βγες / πιες / δώσε / φύγε — built straight from the perfective stem. Because you command with exactly these verbs constantly ("look!", "tell me", "take it", "come in"), they are worth drilling as a set on the irregular imperatives page. And the aorists (είδα, είπα, ήπια…) get their full past paradigm on irregular and suppletive aorists.

Same verb, both stems, one breath

Because the imperfective and perfective stems look so different here, these verbs are the clearest place to hear aspect at work — the ongoing frame on the present stem, the bounded act on the suppletive one:

Κάθε πρωί πίνω καφέ, αλλά σήμερα ήπια και τον δικό σου.

káthe proí píno kafé, alá símera ípia ke ton dhikó su

Every morning I drink coffee, but today I drank yours too. (imperfective πίνω vs perfective ήπια)

Δεν βλέπω τίποτα από δω· άσε με να δω από το παράθυρο.

dhen vlépo típota apó dho· áse me na dho apó to paráthiro

I can't see anything from here — let me look out of the window. (imperfective βλέπω vs perfective δω)

Common Mistakes

1. Regularising a suppletive verb with -σ- or -ξ-. βλέπω does not become ×βλέψω; its perfective is δω.

❌ Θα βλέψω τι μπορώ να κάνω και θα σε ενημερώσω.

Incorrect — βλέπω is suppletive: θα δω.

✅ Θα δω τι μπορώ να κάνω και θα σε ενημερώσω.

tha dho ti boró na káno ke tha se enimeróso

I'll see what I can do and let you know.

2. Using the aorist stem after θα or να. The aorist βρήκα already carries its past marking; after θα/να you need the bare βρω.

❌ Ελπίζω να βρήκα δουλειά μέχρι το καλοκαίρι.

Incorrect — after να use the bare perfective: να βρω.

✅ Ελπίζω να βρω δουλειά μέχρι το καλοκαίρι.

elpízo na vro dhuliá méchri to kalokéri

I hope to find a job by the summer.

3. Keeping the present stem for a single, completed past. "Ate one souvlaki" is a bounded event, so it needs the perfective έφαγα, not the imperfective έτρωγα.

❌ Χθες το μεσημέρι έτρωγα ένα σουβλάκι και έφυγα.

Incorrect for one finished act — use the aorist έφαγα.

✅ Χθες το μεσημέρι έφαγα ένα σουβλάκι και έφυγα.

chthes to mesiméri éfagha éna suvláki ke éfigha

Yesterday at lunchtime I ate a souvlaki and left.

4. Adding a plain -σ- to δίνω. The perfective changes the vowel too: δώσω, not ×δίνσω or ×δίσω.

❌ Θα σου δίνσω πίσω τα λεφτά την Παρασκευή.

Incorrect — δίνω → δώσω (the ι becomes ω).

✅ Θα σου δώσω πίσω τα λεφτά την Παρασκευή.

tha su dhóso píso ta leftá tin Paraskeví

I'll give you back the money on Friday.

Key Takeaways

The commonest verbs form their perfective stem suppletively — a whole new form, not a -σ- suffix: βλέπω → δω, λέω → πω, τρώω → φάω, βρίσκω → βρω.
The architecture is normal: two stems per verb, feeding the aorist, both perfective futures/subjunctives and the imperative. Only the shape is irregular.
Many perfectives shrink to one syllable (δω, πω, βρω, μπω, βγω, πιω) — these are pure dependent forms and need θα or να to stand.
The motion verbs take a -ηκα aorist (βρήκα, μπήκα, βγήκα); the others have individual pasts (είδα, είπα, ήπια, έφαγα, πήγα, πήρα).
These are the highest-frequency verbs in Greek, so the dozen irregular pairs are the best-value memorisation in the whole verb system.

Now practice Greek

Reading grammar gets you part of the way. The exercises are where it sticks — free, no signup needed.

Start learning Greek →