Number and the Four Cases

In English a noun barely changes: man, man's, men, men's — that is the whole story, and word order does the rest. Greek works differently. A Greek noun carries two pieces of grammatical information in its ending at all times: its number (singular or plural) and its case — the role it plays in the sentence. There are four cases in Modern Greek, and this page shows you the whole machine working on one word, so that the individual declension classes later feel like variations on a shape you already recognise.

The two dimensions: number and case

Number is the familiar one: one thing (singular) versus more than one (plural). Greek marks it in the ending, just as English marks it with -s — but Greek does far more with the ending than add a plural marker.

Case is the dimension English speakers have to build from scratch. The case tells you what the noun is doing: whether it is the subject, the possessor, the object, or the person being addressed. Where English signals these jobs mostly through position ("the dog bit the man" vs. "the man bit the dog") and small words ("of", "to"), Greek signals them by changing the ending of the noun and its article.

The four cases are:

• Nominative — the subject, the "who does it" form, and the form you find in a dictionary.
• Genitive — possession and relationship ("of…"): the man's, of the man.
• Accusative — the direct object, and the form used after most prepositions.
• Vocative — the form used to call or address someone directly ("Hey, doctor!").

One noun, fully declined: ο άνθρωπος

Here is the masculine noun ο άνθρωπος ("the person, the man") in all four cases and both numbers. Look at the noun and the article together — this is the complete grammatical package a Greek speaker keeps in their head for every noun.

The same paradigm in romanization, so you can hear the shape:

Notice something the English speaker must absorb early: the stress moves. In the nominative it sits on the first syllable (άνθρωπος), but in the genitive it jumps forward one syllable (ανθρώπου, ανθρώπων) and again in the accusative plural (ανθρώπους). This is not random — it follows a strict accent law explained on Accent shift in declension. For now, just register that the accent is part of the ending too, and it can shift.

The article does half the work

Look back at the table and cover the noun with your hand. The article alone almost tells you the case:

This is a gift for the learner. Even before you have mastered every noun ending, the little word in front usually pins down the case. ο means nominative singular; του means genitive singular; τους means accusative plural. (There is no article in the vocative — you just call the name or noun directly.) Because the article is so reliable, Greeks learn every noun with its article — never "άνθρωπος" but "ο άνθρωπος" — the way German learners memorise der/die/das.

Now let us see the cases at work, one at a time.

Nominative — the subject

Genitive — possession and "of…"

The genitive answers "whose?" and translates the English possessive 's or the word of. Crucially, the possessor comes after the thing possessed: the logic of this man, not this man's logic in word order.

Accusative — the direct object (and after prepositions)

The accusative is also the case after almost every preposition — σε (to/at), με (with), από (from), για (for): για τους ανθρώπους ("for the people").

Vocative — calling and addressing

The vocative is often identical to the nominative in the plural and in many singular nouns, but for masculine nouns it very often has its own form (γιατρός → γιατρέ, κύριος → κύριε). It is covered fully on Forming the vocative.

Why four cases and not word order

The pay-off of all this ending-changing is freedom of word order. Because the noun's ending already announces its job, Greek can move words around for emphasis without losing the meaning:

Here τον καφέ (accusative) is fronted for emphasis, yet nobody thinks the coffee drank Nikos — the accusative ending and the nominative ο Νίκος make the roles unmistakable. In English, moving "the coffee" to the front like that would sound broken; in Greek it is a normal, expressive sentence. This is the deep reason cases exist: they let the ending, not the slot, carry the grammar.

A word on the missing dative

You will occasionally meet what looks like a fifth case in fixed, formal, or church-flavoured expressions — a leftover of the Ancient Greek dative:

Δόξα τω Θεώ and εντάξει (originally εν τάξει, "in order") contain frozen datives. So do τοις εκατό ("per cent"), εν πάση περιπτώσει ("in any case"), and εν ολίγοις ("in short"). Treat these as vocabulary, not as a living case — you can neither form new datives nor decline nouns into one. For everything the dative once did, modern Greek uses σε + accusative or the genitive.

Common Mistakes

1. Leaving the noun in the nominative when it is the object. English nouns don't change for the object role, so learners forget to switch to the accusative.

2. Not changing the article. The article is not decoration; it must match the case of the noun.

3. Trying to build a dative for "to someone". There is no living dative; use σε + accusative.

4. Forgetting the accent shift in the genitive. The stress moves forward; keeping it in place is a spelling error.

Key Takeaways

• A Greek noun always carries two signals in its ending: number (singular/plural) and case (nominative, genitive, accusative, vocative).
• The four cases mark grammatical role: subject (nom.), possessor / "of" (gen.), object and post-preposition (acc.), address (voc.).
• The article changes with the case — often more clearly than the noun — so always learn a noun with its article: ο άνθρωπος, not just άνθρωπος.
• Cases let Greek reorder words for emphasis without ambiguity — the ending, not the position, tells you who does what.
• There is no dative in Modern Greek; use σε + accusative for "to someone." The dative survives only in frozen phrases like δόξα τω Θεώ.
• Watch the stress — it can shift between cases (άνθρωπος → του ανθρώπου). Each declension class page shows exactly where.