English has a firm instinct that a noun phrase gets one determiner. You say the house or this house or my house or all houses, never two at once — all the houses feels almost like an exception. Greek's instinct is the opposite. A whole class of words — όλος, αυτός, εκείνος, numerals, ο ίδιος — stack on top of the article rather than replacing it. This page sorts out which quantifiers demand the article, which forbid it, and the small spelling detail (the final -ν) that a shipped page here once got wrong.
όλος: the quantifier that sits outside the article
The rule for όλος ("all, whole") is simple to state and hard to remember, because it is the exact reverse of the English habit: όλος comes before the article, and the article stays. The pattern is
όλος + article + noun
and all three agree in gender, number and case. English all the children keeps the; but English also freely says all children — Greek does not drop the article here.
Όλα τα παιδιά έφυγαν εκδρομή εκτός από δύο.
óla ta pedhiá éfighan ekdhromí ektós apó dhío
All the children went on the trip except two.
Όλος ο κόσμος περίμενε το αποτέλεσμα με αγωνία.
ólos o kózmos perímene to apotélezma me aghonía
Everyone was waiting for the result anxiously.
Δούλεψα όλη τη νύχτα για να προλάβω την προθεσμία.
dhúlepsa óli ti níchta ya na prolávo tin prothezmía
I worked all night to make the deadline.
Notice όλος ο κόσμος literally is "all the world" but idiomatically means everyone — one of the highest-frequency phrases in the language. The construction runs through every case; here it is with the noun as object and in the genitive:
Έψαξα όλο το σπίτι και δεν βρήκα τα γυαλιά μου.
épsaksa ólo to spíti ke dhen vríka ta yaliá mu
I searched the whole house and couldn't find my glasses.
Η γνώμη όλων των συναδέλφων μετράει σ' αυτή την απόφαση.
i ghnómi ólon ton sinadhélfon metrái saftí tin apófasi
Every colleague's opinion counts in this decision.
The final-ν that makes it όλο τον χρόνο
Here is the detail that catches even confident learners. In the masculine accusative singular, the article is τον, and — like every masculine τον — it keeps its final -ν. Drop the -ν and you have written το, which is the neuter article, so the whole phrase silently changes gender and stops agreeing.
Έλειπε στο εξωτερικό όλον τον χρόνο και γύρισε τα Χριστούγεννα.
élipe sto eksoterikó ólon ton chróno ke yírise ta Christúyena
He was abroad all year and came back at Christmas.
Περίμενα όλο τον μήνα ένα τηλεφώνημα που δεν ήρθε.
perímena ólo ton mína éna tilefónima pu dhen írthe
I waited the whole month for a call that never came.
So it is όλο τον χρόνο / όλον τον χρόνο, never ×όλο το χρόνο. (όλος itself can appear as όλο or όλον before the masculine noun; both are fine. The article τον, however, must keep its -ν, because χρόνος is masculine.) The general final-ν rule — masculine τον always, feminine την before a vowel or κ/π/τ/ξ/ψ/μπ/ντ/γκ/τσ/τζ — is on the definite article's forms.
όλος without an article — the two real cases
The brief that "όλος needs the article" is 95% right, but a page that never showed the exceptions would be lying, so here they are.
With a bare noun, όλος means "every kind of / all sorts of" — a different, distributive sense:
Ήρθαν άνθρωποι από όλες τις χώρες στο συνέδριο.
írthan ánthropi apó óles tis chóres sto sinédhrio
People came from all countries to the conference.
That still has the article. The genuinely article-less case is the idiom με όλη + abstract: με όλη μου την καρδιά keeps the article, but ολοταχώς, ολομόναχος and set phrases like πάνω απ' όλα ("above all") have absorbed όλος into a single word. And όλοι on its own — no noun at all — simply means "everybody":
Όλοι ήξεραν την αλήθεια εκτός από μένα, όπως πάντα.
óli íkseran tin alíthia ektós apó ména, ópos pánda
Everyone knew the truth except me, as usual.
This last is όλος nominalized by nothing — it stands alone as a pronoun. The fuller behaviour of the word is on όλος: 'all' and 'whole'.
Numbers: the article is what makes them definite
A numeral in front of a bare noun just counts (δύο φίλοι = "two friends"). Add the article and you get the two — a specific, known pair, exactly like English the two of them.
Οι δύο φίλοι δεν μιλιούνται πια, κρίμα.
i dhío fíli dhen miliúnde pia, kríma
The two friends aren't on speaking terms any more — a shame.
Τα τρία παιδιά της σπουδάζουν όλα στο εξωτερικό.
ta tría pedhiá tis spudházun óla sto eksoterikó
Her three children are all studying abroad.
Θα πάρω και τα δύο, δεν μπορώ να διαλέξω.
tha páro ke ta dhío, dhen boró na dhialékso
I'll take both — I can't choose.
That last one is the everyday equivalent of "both": και τα δύο ("and the two"). Most numerals never change shape, but ένας, τρεις, τέσσερις decline and agree in case; that machinery, plus what happens to the noun's case after a number, is on case with numbers.
Demonstratives: the article is compulsory
This is the pattern English speakers forget most often, because English demonstratives replace the article. Greek αυτός and εκείνος sit in front of the article, and the article must be there:
αυτός / εκείνος + article + noun
Αυτό το βιβλίο άλλαξε τον τρόπο που σκέφτομαι.
aftó to vivlío álakse ton trópo pu skéftome
This book changed the way I think.
Εκείνη τη μέρα έβρεχε ασταμάτητα από το πρωί.
ekíni ti méra évreche astamátita apó to proí
That day it rained non-stop from the morning.
Δεν αντέχω άλλο αυτόν τον θόρυβο από το εργοτάξιο.
dhen andécho álo aftón ton thórivo apó to erghotáksio
I can't stand this noise from the building site any more.
×αυτό βιβλίο is simply not Greek. The one context where the article drops is when the demonstrative stands alone as a pronoun — Αυτό μου αρέσει ("I like this") — because there is no noun for the article to attach to. Full paradigm on demonstratives.
ο ίδιος: article on both sides
ίδιος ("same / -self") takes the article before it, unlike the outside-the-article quantifiers — ο ίδιος άνθρωπος ("the same person"). Position matters: ο ίδιος ο πρωθυπουργός, with a second article, means "the prime minister himself."
Κάνουμε τα ίδια λάθη κάθε φορά, δεν μαθαίνουμε ποτέ.
kánume ta ídhia láthi káthe forá, dhen mathénume poté
We make the same mistakes every time — we never learn.
The quantifiers that forbid the article
Balancing the picture: a large set of quantifiers fill the determiner slot themselves and therefore reject the article. Putting one in is a real and common error.
| Takes the article | Refuses the article |
|---|---|
| όλος ο κόσμος | κάθε άνθρωπος |
| αυτό το σπίτι | κάποιο σπίτι |
| οι δύο φίλοι | μερικοί φίλοι |
| ο ίδιος δρόμος | κανένας δρόμος |
Κάθε μέρα πίνω τον καφέ μου στην ίδια καφετέρια.
káthe méra píno ton kafé mu stin ídhia kafetéria
Every day I have my coffee at the same café.
Μερικοί άνθρωποι δεν αλλάζουν ποτέ, ό,τι κι αν γίνει.
merikí ánthropi dhen alázun poté, óti ki an yíni
Some people never change, no matter what happens.
The dividing line is meaning: definite quantifiers (all of a known set, this one, the two, the same) take the article; indefinite ones (each, some, a certain, no) supply their own determination and refuse it. κάθε, κάποιος, μερικοί and κανένας each have their own page under determiners.
Common Mistakes
1. Dropping the article after όλος. The single most frequent error, straight out of English all children.
❌ Όλοι μαθητές πρέπει να φέρουν ταυτότητα.
Incorrect — όλος keeps the article: όλοι οι μαθητές.
✅ Όλοι οι μαθητές πρέπει να φέρουν ταυτότητα στις εξετάσεις.
óli i mathités prépi na férun taftótita stis eksetásis
All students must bring ID to the exams.
2. Leaving the phrase in the nominative. A duration phrase is an accusative; όλος and the article go accusative with the noun, whatever the verb is doing.
❌ Έμεινε στο νησί όλος ο χρόνος.
Incorrect — a duration is accusative from end to end: όλον τον χρόνο.
✅ Έμεινε στο νησί όλον τον χρόνο και δούλευε σε ταβέρνα.
émine sto nisí ólon ton chróno ke dhúleve se tavérna
He stayed on the island all year and worked at a taverna.
3. Treating a Greek demonstrative like an English one. αυτός does not replace the article; it stacks on it.
❌ Αυτό βιβλίο είναι πολύ βαρετό.
Incorrect — a demonstrative requires the article: αυτό το βιβλίο.
✅ Αυτό το βιβλίο είναι πολύ βαρετό, δεν το τελείωσα.
aftó to vivlío íne polí varetó, dhen to telíosa
This book is really boring — I didn't finish it.
4. Adding the article after κάθε. κάθε is itself the determiner.
❌ Κάθε η μέρα είναι διαφορετική εδώ.
Incorrect — κάθε takes a bare noun: κάθε μέρα.
✅ Κάθε μέρα είναι διαφορετική εδώ, ποτέ δεν βαριέσαι.
káthe méra íne dhiaforetikí edhó, poté dhen variése
Every day is different here — you never get bored.
5. Forgetting the article on a definite number. Without it, δύο αδέρφια means "two brothers," not "the two brothers."
❌ Δύο αδέρφια μου ζουν στο εξωτερικό, τους βλέπω σπάνια.
Incorrect for 'my two brothers' (a known pair) — use the article: Τα δύο αδέρφια μου.
✅ Τα δύο αδέρφια μου ζουν στο εξωτερικό, τους βλέπω σπάνια.
ta dhío adhérfia mu zun sto eksoterikó, tus vlépo spánia
My two brothers live abroad — I rarely see them.
Key Takeaways
- όλος takes the article and keeps it: όλος ο κόσμος, όλη τη μέρα, όλα τα παιδιά. This is the reverse of English, which freely says all children.
- Build it as one fixed shape — όλος + article + noun — agreeing throughout, rather than translating "all the."
- The masculine article τον keeps its -ν: it is όλον τον χρόνο, not ×όλο το χρόνο; dropping the -ν turns the article neuter.
- Numbers and demonstratives keep the article for a definite reading: οι δύο φίλοι, και τα δύο, αυτό το βιβλίο, εκείνη τη μέρα. Greek demonstratives stack on the article; they never replace it.
- ο ίδιος puts the article first (ο ίδιος δρόμος); a doubled article gives "himself" (ο ίδιος ο πρωθυπουργός).
- Indefinite quantifiers refuse the article: κάθε, κάποιος, μερικοί, κανένας. Definite = article; indefinite = no article.
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- όλος: 'all' and 'whole'A2 — One Greek word covers English all, whole, everybody and everything — and the noun's number decides which: όλο το βιβλίο is 'the whole book' but όλα τα βιβλία is 'all the books'. Full paradigm of όλος (including the single genitive plural όλων), the floating use in Τα έφαγε όλα, and the idioms όλο και πιο, πάνω απ' όλα, είμαι όλος αυτιά.
- Demonstratives: αυτός and εκείνοςA1 — Greek needs only two demonstratives where English has four — αυτός/αυτή/αυτό for whatever is near or in focus, εκείνος/εκείνη/εκείνο for whatever is further off in space, time or attention — with the full declension, the accompanying article (αυτό το βιβλίο), the same words standing alone as pronouns (Θέλω αυτό), and the regional τούτος.
- Definite Article: Full DeclensionA1 — The complete twenty-four-cell grid of the Greek definite article, drilled one form at a time — the three overlaps that trip everyone up (του for two genders, οι for two, το doubling as neuter subject and object), and the τον/την final-ν rule that decides whether the -ν stays.