Gender & Number Agreement — I can use basic gender and number agreement with common adjectives in simple phrases at my level. - Greek

SECTION 1

Historical Context & Motivation

If you've ever studied Spanish or French, you know that adjectives sometimes change form depending on the noun they describe. Greek takes this concept even further. Modern Greek inherited a rich system of grammatical gender and number agreement from Ancient Greek, one of the oldest documented Indo-European languages. Understanding why Greek works this way helps you see that agreement isn't random — it's a system that evolved over thousands of years to keep meaning clear and precise.

~3000 BCE • Proto-Indo-European Roots

The ancestor of Greek already had a three-gender system (masculine, feminine, neuter) with adjectives agreeing with nouns, laying the foundation for agreement patterns found in Greek, Latin, Sanskrit, and many other languages.

~800 BCE • Homeric Greek

The Iliad and the Odyssey showcase complex adjective-noun agreement across three genders, three numbers (singular, dual, plural), and multiple cases. Agreement was essential for understanding long, poetic sentences.

~300 BCE • Koine Greek Simplification

As Greek spread across the Mediterranean after Alexander the Great, the dual number disappeared. However, three genders and singular/plural agreement remained firmly in place.

1976 CE • Demotic Greek Becomes Official

Modern Greece adopted Demotic (spoken) Greek as its official language. Gender and number agreement survived every stage of the language's evolution and remains a core grammar rule today.

So why does agreement matter for you as a language learner? Without it, your sentences would sound jumbled and confusing to a native speaker — like saying "the tall books is red" in English. Agreement is the glue that holds Greek phrases together. The core question this lesson addresses is: How do I change an adjective's ending so it correctly matches the gender and number of the noun it describes?

SECTION 2

Core Principles of Gender & Number Agreement

Before diving into specific endings, you need to understand a few foundational ideas about how Greek handles adjectives. These principles will guide every adjective choice you make.

Three Genders

Every Greek noun belongs to one of three genders: αρσενικό (masculine), θηλυκό (feminine), or ουδέτερο (neuter). Gender is not always logical — a table (τραπέζι) is neuter, while a chair (καρέκλα) is feminine.

Two Numbers

Greek uses ενικός (singular) for one item and πληθυντικός (plural) for more than one. Adjectives must switch between singular and plural to match the noun.

The Adjective Follows the Noun

The adjective must take the same gender and number as the noun it modifies. This is called συμφωνία (agreement). Think of it like a chameleon changing color to match its surroundings.

The Article Is Your Clue

The definite article (ο, η, το) tells you the gender of the noun instantly. Masculine nouns use ο, feminine nouns use η, and neuter nouns use το. Always look at the article first.

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KEY TAKEAWAY

Think of gender and number agreement like a dress code. If the noun is wearing a "masculine singular" outfit, the adjective has to wear the same outfit. If the noun switches to a "feminine plural" outfit, the adjective changes clothes too. The article (ο, η, το) is like a name tag that tells you what outfit to wear.

SECTION 3

Visualizing the Agreement System

The following diagram maps out how a single adjective — καλός (good) — changes its ending across all six possible combinations of gender and number. Notice how the stem καλ- stays the same while the ending shifts.

This diagram shows the adjective καλός (good) in all six forms. The violet boxes represent masculine, the pink boxes represent feminine, and the cyan boxes represent neuter.

Notice the pattern: the stem καλ- never changes. Only the ending shifts to signal gender (masculine, feminine, or neuter) and number (singular or plural). This is the heart of Greek agreement. Once you learn these six endings for one adjective, you can apply the same pattern to dozens of common adjectives like μεγάλος (big), μικρός (small), ωραίος (beautiful), and νέος (new).

SECTION 4

How Agreement Works Step by Step

Greek adjective agreement follows a predictable process. Every time you want to describe a noun with an adjective, you run through the same mental checklist. Let's break it down into a clear procedure.

The Agreement Process

Step 1 — Identify the noun. Look at the noun you want to describe. What is it? For example: σπίτι (house).
Step 2 — Check the article. The article tells you the gender. Το σπίτι → "το" = neuter.
Step 3 — Determine the number. Is it one house (singular) or many houses (plural)? Το σπίτι = singular.
Step 4 — Apply the matching ending. Neuter singular → ending -ο. So "big house" = το μεγάλ-ο σπίτι.

The -ος / -η / -ο Adjective Pattern

The most common adjective type in Greek is the -ος / -η / -ο pattern. The dictionary form always ends in -ος (masculine singular). You then swap the ending based on gender and number. Here is the complete ending chart.

	Masculine (ο)	Feminine (η)	Neuter (το)
Singular	-ος → καλός	-ή → καλή	-ό → καλό
Plural	-οί → καλοί	-ές → καλές	-ά → καλά

Endings for -ος / -η / -ο adjectives (nominative case)

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Accent Shift Alert

Notice that the accent mark sometimes moves. In the masculine plural, the accent shifts to the ending: καλοί. Don't worry about memorizing accent rules right now — just be aware that the stress can shift in the plural.

SECTION 5

Common Adjectives & Their Forms

Now let's see the agreement system in action with the adjectives you'll use most often in everyday Greek conversation. The table below lists ten high-frequency adjectives with all six forms. These adjectives all follow the same -ος / -η / -ο pattern, which means once you internalize this pattern, you can handle all of them.

Meaning	Masc. Sg.	Fem. Sg.	Neut. Sg.	Masc. Pl.	Fem. Pl.	Neut. Pl.
good	καλός	καλή	καλό	καλοί	καλές	καλά
big	μεγάλος	μεγάλη	μεγάλο	μεγάλοι	μεγάλες	μεγάλα
small	μικρός	μικρή	μικρό	μικροί	μικρές	μικρά
new	νέος	νέα	νέο	νέοι	νέες	νέα
beautiful	ωραίος	ωραία	ωραίο	ωραίοι	ωραίες	ωραία
old	παλιός	παλιά	παλιό	παλιοί	παλιές	παλιά

Six common adjectives with all agreement forms

Follow this flowchart every time you need to choose an adjective form. Start with the noun, check its article for gender, decide singular or plural, then apply the correct ending.

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Variation: -ος / -α / -ο Adjectives

Some adjectives like ωραίος (beautiful) and νέος (new) use -α instead of -ή in the feminine singular and -ες instead of -ές in the feminine plural. The pattern is the same — only the vowel in the feminine forms differs. Look at the table above to spot these slight variations.

SECTION 6

Worked Example: Building Agreeing Phrases

Let's walk through a complete example. Suppose you want to say "the small cats" in Greek. The word for cat is γάτα and the adjective for small is μικρός. How do you put them together correctly?

Translating "the small cats" into Greek

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Step 1 — Identify the Noun

The noun is γάτα (cat). We want the plural because we're talking about more than one cat, so: γάτες (cats).

Noun: γάτες
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Step 2 — Determine Gender Using the Article

The singular article for γάτα is η (η γάτα). This tells us that γάτα is feminine. In the plural, the feminine article becomes οι.

Gender: feminine · Number: plural · Article: οι
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Step 3 — Find the Adjective Stem

The dictionary form is μικρός. Remove the masculine singular ending -ος to find the stem.

Stem: μικρ-
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Step 4 — Apply the Correct Ending

We need the feminine plural ending. From our chart: feminine plural = -ές. Attach it to the stem: μικρ- + -ές = μικρές.

Adjective: μικρές
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Step 5 — Assemble the Phrase

Put the article, adjective, and noun together. In Greek, the adjective typically goes between the article and the noun or after the noun.

οι μικρές γάτες = the small cats ✓

Let's do one more quick example. To say "the big book" (book = βιβλίο, article = το, so neuter singular), you take μεγάλος → stem μεγάλ- → neuter singular ending -ο → το μεγάλο βιβλίο. The process is always the same: identify gender and number, then match the ending.

SECTION 7

Common Mistakes & How to Avoid Them

Even after learning the rules, learners frequently make a few predictable errors. Understanding these pitfalls now will save you a lot of frustration later. The table below compares common incorrect forms with their correct versions and explains why the mistake happens.

Common Mistake ✗	Correct Form ✓	Why It's Wrong
η μικρός γυναίκα	η μικρή γυναίκα	Masculine -ος ending used with a feminine noun. Should be -ή.
τα μεγάλο σπίτια	τα μεγάλα σπίτια	Singular adjective -ο used with a plural noun. Should be -ά.
ο καλή δάσκαλος	ο καλός δάσκαλος	Feminine adjective ending used with a masculine noun and article.
οι νέος φοιτητές	οι νέοι φοιτητές	Singular adjective with plural article and noun. Should be -οι.
το ωραίος αυτοκίνητο	το ωραίο αυτοκίνητο	Masculine ending used with neuter noun. Should be -ο.

Five common agreement errors and their corrections

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KEY TAKEAWAY

The article is your best friend. If you see ο, your adjective ends in -ος (singular) or -οί (plural). If you see η, use -ή or -ές. If you see το, use -ό or -ά. When in doubt, always look at the article first — it's like a road sign telling you which lane to drive in.

SECTION 8

Connection to More Advanced Greek Grammar

The gender and number agreement you've learned here is the foundation for much more complex structures in Greek. As you progress, you'll encounter case agreement (adjectives also change based on the grammatical role of the noun in a sentence), irregular adjectives (not all adjectives follow the -ος / -η / -ο pattern), and predicate agreement (adjectives that aren't right next to the noun but still must agree with it). The table below previews how this lesson connects to what comes next.

What You Learned Here	What Comes Next
Gender & number agreement in the nominative case (subject of the sentence)	Agreement in the accusative case (direct objects) and genitive case (possession), where endings change again
Regular -ος / -η / -ο adjectives	Irregular adjectives like πολύς (much/many) and μεγάλος in oblique cases
Adjective placed next to the noun (attributive position)	Predicate adjectives with the verb «είμαι» (to be): Η γάτα είναι μικρή.
Simple phrases: article + adjective + noun	Complex sentences with multiple adjectives, relative clauses, and participles — all requiring agreement

From basic agreement to advanced grammar

Don't feel overwhelmed by what's ahead. The skill you're building now — matching adjective endings to noun gender and number — is the same skill you'll use in every future Greek grammar topic. Master this pattern, and you'll have a solid toolkit for tackling cases, irregular forms, and complex sentences down the road.

SECTION 9

Practice Problems

Test your understanding of gender and number agreement with these five problems. Each one builds on the principles and patterns covered in this lesson. Try to work through each problem before reading the answer.

Question 1: CONCEPTUAL

Why does the adjective μικρός change to μικρή when describing the noun γυναίκα (woman)? Explain the grammatical reason in your own words.

Show answer

The noun γυναίκα takes the article η, which marks it as feminine. In Greek, adjectives must agree in gender (and number) with the noun they describe. Since μικρός ends in -ος (the masculine singular ending), it must change to the feminine singular ending -ή, becoming μικρή. This is the principle of gender agreement: the adjective's ending must mirror the gender of the noun.

Question 2: BASIC

Fill in the correct form of the adjective καλός (good) in each blank: (a) ο _____ φίλος, (b) η _____ ιδέα, (c) το _____ βιβλίο.

Show answer

(a) ο καλός φίλος — masculine singular, so the ending stays -ος. (b) η καλή ιδέα — feminine singular, so the ending changes to -ή. (c) το καλό βιβλίο — neuter singular, so the ending changes to -ό. In each case, you identify the gender from the article (ο, η, το) and apply the corresponding singular ending.

Question 3: INTERMEDIATE

Translate into Greek: "the beautiful houses." The word for house is σπίτι (neuter, article: το), and the adjective for beautiful is ωραίος. Be sure to use correct gender, number, and article.

Show answer

The answer is τα ωραία σπίτια. Here's the reasoning: σπίτι is neuter (article: το). In the plural, the neuter article becomes τα and σπίτι becomes σπίτια. The adjective ωραίος has the stem ωραί-. The neuter plural ending is -α (note: this adjective uses -α rather than -ά in the feminine form too, but the neuter plural is also -α). So: τα ωραία σπίτια.

Question 4: APPLIED

You're at a Greek market and want to tell the vendor you want "the big tomatoes." The word for tomato is ντομάτα (feminine, article: η). The adjective is μεγάλος. Write the complete phrase with the correct article, adjective form, and noun form.

Show answer

The correct phrase is οι μεγάλες ντομάτες. Ντομάτα is feminine (η ντομάτα). In the plural, the article becomes οι, and the noun becomes ντομάτες. The adjective μεγάλος has the stem μεγάλ-. The feminine plural ending is -ες, so it becomes μεγάλες. The complete phrase: οι μεγάλες ντομάτες. Every element — article, adjective, and noun — is now feminine plural.

Question 5: CRITICAL THINKING

A student writes: «Τα νέος αυτοκίνητα είναι μικρός.» Identify every agreement error in this sentence, correct each one, and explain the rule that was broken. (αυτοκίνητο = car, neuter.)

Show answer

There are two agreement errors. First, νέος is masculine singular but must agree with αυτοκίνητα (neuter plural). The correct form is νέα (neuter plural ending -α). Second, μικρός is masculine singular but serves as a predicate adjective describing τα αυτοκίνητα, which is neuter plural. Even though the adjective comes after the verb, it must still agree, so it becomes μικρά. The corrected sentence: Τα νέα αυτοκίνητα είναι μικρά. (The new cars are small.) This problem shows that agreement applies both to attributive adjectives (before the noun) and predicate adjectives (after the verb είναι).

SUMMARY

Lesson Summary

Summary

Greek adjectives must match their nouns in both gender (masculine, feminine, neuter) and number (singular or plural). The most common adjective pattern is -ος / -η / -ο, where you keep the stem and swap the ending: masculine -ος/-οί, feminine -ή/-ές, neuter -ό/-ά. The definite article (ο, η, το) is your most reliable clue for determining a noun's gender.

To build a correct phrase, follow the four-step process: identify the noun, check the article for gender, determine singular or plural, then apply the matching adjective ending. This agreement system is the foundation for all Greek grammar, and mastering it now will prepare you for case agreement, irregular adjectives, and complex sentence structures in the future.