The Greek imperfect and aorist do not label events as objectively “unfinished” and “finished.” They present the same past situation from different viewpoints. Choose the imperfect when the listener is placed inside a process, state, open habit, or background. Choose the aorist when an occurrence or finite series is packaged as a bounded whole.
This page is a one-screen routing tool. Formation and full diagnostics already belong to Aspect in the Past and Choosing the Right Aspect.
The decision flow
| Ask | If yes | Route |
|---|---|---|
| Am I inside the situation as it unfolds? | imperfect | internal-process branch |
| Is it a state, description, background, or open habit? | imperfect | open/background branch |
| Am I packaging an occurrence or delimited series as one bounded whole? | aorist | bounded-whole branch |
| Could either viewpoint fit the same real-world situation? | both may be grammatical | construal and grey-zone branch |
Στις οκτώ έγραφα ακόμη το μήνυμα για τον πελάτη.
stis októ éghrafa akómi to mínima ya ton peláti.
At eight I was still writing the message for the client. (internal view → imperfect)
Στις οκτώ έγραψα το μήνυμα και το έστειλα αμέσως.
stis októ éghrapsa to mínima ke to éstila amésos.
At eight I wrote the message and sent it immediately. (bounded occurrence → aorist)
The real-world writing event may be similar. The first sentence opens it and looks inside; the second packages it as a narrative step. For endings and stem formation, continue to Using the Imperfect or Using the Aorist.
The high-value pattern: background plus interruption
An ongoing frame normally takes the imperfect; the event presented as entering that frame takes the aorist.
Μιλούσαμε για τις διακοπές όταν κόπηκε το ρεύμα.
milúsame ya tis dhiakopés ótan kópike to révma.
We were talking about the holidays when the power went out.
Here μιλούσαμε opens the conversation from inside, while κόπηκε packages the power cut as a bounded event. This is a strong template, not a command that every clause after όταν must be aorist. If the second situation is itself ongoing or repeated, it may also be imperfect.
Το τηλέφωνο χτυπούσε συνέχεια ενώ προσπαθούσα να κοιμηθώ.
to tiléfono chtipúse sinéchia enó prospathúsa na kimithó.
The phone kept ringing while I was trying to sleep. (two internal processes)
Open habit versus finite series
An open past habit invites the imperfect. Repetition alone, however, does not force imperfective aspect: a finite, contextually closed series can be viewed as one bounded package.
Όσο έμενα στην Πάτρα, πήγαινα στη δουλειά με ποδήλατο.
óso émena stin Pátra, píyena sti dhuliá me podhílato.
While I lived in Patras, I used to cycle to work. (open habit → imperfect)
Και τις τέσσερις μέρες του συνεδρίου πήγα στο ξενοδοχείο με ποδήλατο.
ke tis téseris méres tu sinedhríu pígha sto ksenodhochío me podhílato.
On all four days of the conference I cycled to the hotel. (finite series → aorist)
Κάθε μέρα often cues an open habit, while a count or closed interval often supplies a boundary. These are contextual clues only. The speaker can still select a different viewpoint when the discourse requires it.
Duration does not choose by itself
A long event can be bounded with the aorist or opened from inside with the imperfect. Compare the discourse work done by the same deadline phrase.
Χθες δούλεψα όλο το βράδυ και έκλεισα μόνος μου το γραφείο.
chthes dhúlepsa ólo to vrádhi ke éklisa mónos mu to ghrafío.
Yesterday I worked all evening and closed the office myself. (closed overview → aorist)
Χθες δούλευα όλο το βράδυ, χωρίς να ξέρω πότε θα τελειώσω.
chthes dhúleva ólo to vrádhi, chorís na kséro póte tha telióso.
Yesterday I was working all evening without knowing when I would finish. (duration viewed internally → imperfect)
The duration does not contain a hidden tense instruction. In the first sentence it is packaged as a bounded block in a sequence; in the second it is opened from inside, with the endpoint not yet in view.
Common Mistakes
“One event means aorist”
A single journey can be shown from inside when another event locates a point within it.
Όταν με είδες, περνούσα τη γέφυρα με τα πόδια.
ótan me ídhes, pernúsa ti yéfira me ta pódhia.
When you saw me, I was crossing the bridge on foot. (one crossing viewed internally)
Πέρασα τη γέφυρα σε δέκα λεπτά και πρόλαβα το τρένο.
pérasa ti yéfira se dhéka leptá ke prólava to tréno.
I crossed the bridge in ten minutes and caught the train. (bounded crossing)
“Repeated means imperfect”
An explicit closed set can be packaged perfectively.
Το κουδούνι χτύπησε τέσσερις φορές πριν ανοίξω.
to kudhúni chtípise téseris forés prin aníkso.
The doorbell rang four times before I opened. (finite series → aorist)
Το κουδούνι χτυπούσε κάθε πρωί λίγο πριν τις επτά.
to kudhúni chtipúse káthe proí lígho prin tis eptá.
The bell used to ring every morning just before seven. (open habit → imperfect)
“A time expression makes the choice”
Χθες, όλη μέρα, κάθε εβδομάδα, and counts influence the likely construal but do not control the verb mechanically. Apply the bounded-versus-internal question to the whole context.
Χθες το σύστημα λειτουργούσε κανονικά όταν άρχισαν τα προβλήματα.
chthes to sístima liturghúse kanoniká ótan árchisan ta provlímata.
Yesterday the system was working normally when the problems began.
Key Takeaways
- Imperfect: internal process, state, description, background, or open habit.
- Aorist: an occurrence or finite series presented as a bounded whole.
- A single event can be imperfective; a delimited repeated series can be perfective.
- Duration, counts, and adverbs are contextual cues, never automatic switches.
- If both viewpoints fit, choose the meaning you intend and follow the full aspect decision guide.
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Start learning Greek →Related Topics
- Aspect in the Past: Imperfect vs AoristA2 — For verbs that supply an aspect pair, Greek contrasts the imperfect's internal or unbounded view (έγραφα) with the aorist's bounded view (έγραψα); context and construal, not event count alone, decide the aspect.
- Using the ImperfectA2 — The four jobs the imperfect (παρατατικός) does — the ongoing background of a past scene, a repeated or habitual past, the description of past states and settings, and a softened, polite request — each set against the bounded viewpoint of the aorist and mapped onto English 'was doing / used to do / would do'.
- Using the AoristA2 — The aorist is Greek's default perfective past: it presents an event, a narrative step, a result or even a finite series as one bounded whole — and often lines up with the English simple past while contrasting with the imperfect's internal view.