Put να in front of the perfective stem and you get the workhorse of everyday Greek: a subordinated action seen as a single, complete act — do it, finish it, one time. να γράψω ("to write it, once"), να φύγω ("to leave"), να δω ("to see"). This is the form you will reach for most, because after θέλω να, πρέπει να, μπορώ να and most other verbs, Greek's default is the perfective. There is one detail that trips up nearly every learner, and it deserves top billing: the aorist subjunctive has no augment.
How it is built (and the one big trap)
You take the perfective stem — the one that also underlies the past tense — and you add the ordinary present endings. No augment, no special subjunctive endings.
| Person | Aorist indicative (past) | να-aorist (subjunctive) |
|---|---|---|
| 1sg | έγραψα | να γράψω |
| 2sg | έγραψες | να γράψεις |
| 3sg | έγραψε | να γράψει |
| 1pl | γράψαμε | να γράψουμε |
| 2pl | γράψατε | να γράψετε |
| 3pl | έγραψαν | να γράψουν(ε) |
Look at the left column. The past tense carries έ- at the front (έγραψα, é-ghrapsa) — the augment, a prefix that hosts the stress in the past. The right column has none of it. That is because the augment is a marker of past indicative time, and the subjunctive has no tense — να γράψω does not say "when", only "which aspect". So the moment you leave the indicative past, the augment must go.
Έγραψα το μήνυμα αλλά δεν το έστειλα ακόμα.
éghrapsa to mínima alá dhen to éstila akóma
I wrote the message but haven't sent it yet. (past → augment)
Πρέπει να γράψω το μήνυμα τώρα, θα το ξεχάσω.
prépi na ghrápso to mínima tóra, tha to ksecháso
I have to write the message now, or I'll forget. (subjunctive → no augment)
Same perfective stem γραψ-, but the indicative wears the augment and the subjunctive is bare. The endings, meanwhile, are exactly the present endings you already know — only the stem is perfective.
The short, irregular perfectives
A handful of the most frequent verbs have very short, unpredictable perfective stems — single syllables you simply have to know. After να they behave like any other perfective (present endings, no augment), but the stem looks nothing like the present. These are worth memorising as a block; the fuller list is on irregular perfectives.
| Present | να-aorist | Meaning |
|---|---|---|
| βλέπω | να δω | to see |
| λέω | να πω | to say |
| βρίσκω | να βρω | to find |
| τρώω | να φάω | to eat |
| πίνω | να πιω | to drink |
| μπαίνω | να μπω | to go in |
| βγαίνω | να βγω | to go out |
| έρχομαι | να έρθω | to come |
Notice that these still take the normal present endings once you have the stem: να δω, να δεις, να δει, να δούμε, να δείτε, να δουν. And, like every perfective, they refuse the augment — the past είδα ("I saw") is not what follows να.
Be honest with yourself about these: there is no rule that turns βλέπω into δω or λέω into πω. They are historical leftovers, and the only way in is to memorise each present–perfective pair as a unit. The good news is that the list of truly irregular ones is short and they are the verbs you use every hour, so they stick fast with use.
The default in action
Because the perfective is the unmarked choice after most verbs, an enormous share of ordinary sentences use it. Each one below names a single, closed act.
Θέλω να φύγω νωρίς σήμερα, έχω κάτι δουλειές.
thélo na fígho norís símera, écho káti dhuliés
I want to leave early today, I've got a few things to do.
Μπορώ να σε δω αύριο το πρωί για έναν καφέ;
boró na se dho ávrio to proí ya énan kafé
Can I see you tomorrow morning for a coffee?
Πάω να αγοράσω ψωμί, θέλεις κάτι από τον φούρνο;
páo na aghoráso psomí, thélis káti apó ton fúrno
I'm going to buy bread, do you want anything from the bakery?
Ελπίζω να βρω δουλειά σύντομα, ψάχνω μήνες τώρα.
elpízo na vro dhuliá síndoma, psáchno mínes tóra
I hope to find a job soon, I've been looking for months.
Θέλω να πω κάτι, αν μου επιτρέπεις.
thélo na po káti, an mu epitrépis
I'd like to say something, if you'll let me.
Πρέπει να μπω στο σπίτι πριν αρχίσει η βροχή.
prépi na bo sto spíti prin archísi i vrochí
I need to get inside before the rain starts.
Each of these is a one-shot: leave once, see you once, buy bread once, find a job once. Whenever the action is bounded and done — which is most of the time — the perfective is right.
Perfective vs imperfective, side by side
Keep the main verb the same and switch only the stem, and the meaning shifts from "once" to "as a routine". The full decision belongs to aspect after να and aspect in the subjunctive; here is the contrast in one line so the perfective's job is clear.
Πρέπει να πάρω το φάρμακό μου τώρα.
prépi na páro to fármakó mu tóra
I have to take my medicine now. (once → perfective)
Πρέπει να παίρνω το φάρμακό μου κάθε πρωί.
prépi na pérno to fármakó mu káthe proí
I have to take my medicine every morning. (habit → imperfective)
Common Mistakes
1. Adding the augment to the subjunctive. The augment (έ-) is past-tense only; να never takes it.
❌ Πρέπει να έγραψα την αναφορά μέχρι τη Δευτέρα.
Incorrect — no augment after να: πρέπει να γράψω.
✅ Πρέπει να γράψω την αναφορά μέχρι τη Δευτέρα.
prépi na ghrápso tin anaforá méchri ti Dheftéra
I have to write the report by Monday.
2. Using the past form of an irregular. είδα is "I saw" (past); after να the form is δω.
❌ Θέλω να είδα την καινούρια ταινία το σαββατοκύριακο.
Incorrect — the subjunctive of βλέπω is δω, not the past είδα: να δω.
✅ Θέλω να δω την καινούρια ταινία το σαββατοκύριακο.
thélo na dho tin kenúria tenía to savatokíriako
I want to see the new film this weekend.
3. ήρθα where έρθω is needed. ήρθα is "I came"; the subjunctive of έρχομαι is έρθω.
❌ Ελπίζω να ήρθαν όλοι στην ώρα τους.
Incorrect — the subjunctive is έρθουν, not the past ήρθαν: να έρθουν.
✅ Ελπίζω να έρθουν όλοι στην ώρα τους.
elpízo na érthun óli stin óra tus
I hope everyone comes on time.
4. Imperfective for a one-off act. "Leave now, or I'll miss the train" is a single act — perfective.
❌ Πρέπει να φεύγω τώρα, θα χάσω το τρένο.
Incorrect — a single act needs the perfective: πρέπει να φύγω.
✅ Πρέπει να φύγω τώρα, θα χάσω το τρένο.
prépi na fígho tóra, tha cháso to tréno
I have to leave now, I'll miss the train.
Key Takeaways
- The να-aorist = να + the perfective stem
- ordinary present endings (να γράψω, να δεις, να φύγουμε).
- It names a single, bounded act and is the default after most verbs.
- It takes no augment: να γράψω, never ×να έγραψα — the έ- belongs only to the past indicative (έγραψα).
- The high-frequency irregulars are short: να δω, να πω, να βρω, να φάω, να πιω, να μπω, να βγω, να έρθω — and their past forms (είδα, ήρθα) never follow να.
- Switch to the imperfective (να-present) only for habits or ongoing action.
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- Present Subjunctive (να + imperfective)A2 — να followed by the imperfective (present) stem — να γράφω, να διαβάζω — frames a subordinated action as ongoing, habitual, or repeated: θέλω να διαβάζω κάθε μέρα, μου αρέσει να περπατάω.
- Aspect in the Subjunctive (να)B1 — Every να-clause forces the same aspect choice as the rest of the verb: να γράψω (perfective) is 'to write once', να γράφω (imperfective) is 'to keep writing / to write habitually'. The perfective is the default after most verbs; the imperfective is the deliberate choice for ongoing or repeated actions — and it is where English speakers slip most.
- Irregular Perfective StemsB1 — The commonest Greek verbs — see, say, eat, go, take, find, give, drink, come in, go out — build their perfective stem suppletively, swapping in a whole new form (βλέπω → δω, λέω → πω, τρώω → φάω) instead of adding -σ-. There is no rule; because these are the highest-frequency verbs, memorising the twelve or so pairs is one of the best-value things you can do in Greek.