A1 सामान्य 7 min read आसान

Masculine Nouns ending in -os (Nominative and Accusative)

To turn a masculine subject into an object, change 'ο' to 'τον' and drop the final 'ς'.
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Grammar Rule in 30 Seconds

Most masculine nouns ending in -os keep the -os in the nominative and change to -o in the accusative case.

  • Nominative: The subject ends in -os (e.g., o anthropos).
  • Accusative: The direct object ends in -o (e.g., vlepo ton anthropo).
  • Articles: Use 'o' for nominative and 'ton' for accusative.
Subject (o + -os) + Verb + Object (ton + -o)

Overview

Welcome to the heart of the Greek language. Greek nouns are like tiny chameleons. They change their shape based on their job in a sentence.
Most masculine nouns in Greek end in -ος. You will see these words everywhere you look. They represent people, objects, and even abstract concepts.
In this guide, we focus on two main forms. These are the Nominative and the Accusative cases. Think of the Nominative as the 'Subject' form.
It is the noun doing the action. Think of the Accusative as the 'Object' form. It is the noun receiving the action.
Greek is very organized about this. Every noun has a specific article that acts like a tag. For masculine nouns, these tags are ο and τον.
Learning this is like learning the secret handshake of Greek. Once you master it, sentences start making sense. You will stop guessing who is doing what.
It is like turning on the lights in a dark room. Yes, even native speakers get lazy with this sometimes. But you are here to be a pro.
Let’s dive into the mechanics of these -ος nouns.

How This Grammar Works

In English, we usually rely on word order. 'The dog bites the man' is clear. If we swap the words, the meaning changes completely.
In Greek, the endings do the heavy lifting. You can technically move words around more freely. This is because the noun endings tell the story.
For masculine nouns ending in -ος, the change is simple. You just have to watch the letter ς. In the Nominative case, the noun keeps its ς.
It also uses the article ο. This is the 'dictionary form' of the word. When the noun becomes an object, it enters the Accusative case.
Here, the noun loses its ς. The article also changes from ο to τον. It is like the noun is shedding its outer layer.
This happens every time the noun receives an action. It also happens after most prepositions. It is a very consistent rule.
Think of it like a grammar traffic light. Green means subject (-ος), red means object (-ο). It keeps the traffic of your thoughts moving smoothly.

Formation Pattern

1
Creating these forms is a two-step process. It is very logical and satisfying.
2
Start with the Nominative form. This is usually what you learn first.
3
Example: ο φίλος (the friend).
4
Identify the article ο and the ending -ος.
5
To make it Accusative, change the article ο to τον.
6
Remove the final ς from the end of the noun.
7
Result: τον φίλο.
8
Let's try another one with a common object.
9
Start with ο καφές? Wait! That ends in -ης. Let's stick to our rule.
10
Start with ο χυμός (the juice).
11
Change ο to τον.
12
Drop the ς from χυμός.
13
Result: τον χυμό.
14
It works the same for names too. If your friend is named Νίκος, he is ο Νίκος when he speaks. But if you call him, he becomes τον Νίκο. It is like he puts on a different hat for a different role. Just remember: ο and -ς stay together. τον and no -ς stay together. It is a very committed relationship.

When To Use It

Use the Nominative case when the noun is the star. It is the one performing the verb. If you are saying 'The doctor is here,' use ο γιατρός.
The doctor is the subject of the sentence. Use the Accusative case when the noun is the target. If you say 'I see the doctor,' use τον γιατρό.
The doctor is now the object of your vision.
Real-world scenarios make this clear:
  • At a restaurant: You want to order juice. You say 'Θέλω τον χυμό.' (I want the juice).
  • Asking directions: You are looking for the road. You say 'Ψάχνω τον δρόμο.' (I am looking for the road).
  • Meeting people: You are introducing George. 'Αυτός είναι ο Γιώργος.' (This is George).
  • Calling people: You are calling George. 'Φωνάζω τον Γιώργο.' (I am calling George).
You also use the Accusative after the preposition σε (to/in). If you go to the garden, it is στον κήπο. Notice how σε and τον merge into στον. It is a very common shortcut in Greek. Do not be afraid of it. It is your friend.

When Not To Use It

Do not use the Accusative when you are just naming something. If you point at a book and say 'This is a book,' use the Nominative. In Greek, that would be ο κατάλογος (the catalog).
Also, do not use the -ος ending if the noun is the object. This is a very common beginner mistake. It sounds a bit like saying 'Me want cookie' in English.
It is understandable, but not quite right.
Avoid using the article τον for neuter nouns. Neuter nouns often end in -ο as well. For example, το βιβλίο (the book).
Beginners often see the -ο and think it is a masculine object. But masculine objects must have that τον in front. Also, do not drop the ς if the noun is the subject.
If you say ο φίλο, it sounds like the word is unfinished. It is like a sentence waiting for a bus that never comes. Keep your subjects complete and your objects trimmed.

Common Mistakes

One big mistake is forgetting the ν in τον. In modern Greek, we always keep the ν for masculine nouns. This helps distinguish it from the neuter article το. If you say βλέπω το φίλο, it sounds slightly off. Always use τον φίλο. Another mistake is keeping the ς in the Accusative. People say βλέπω τον φίλος. This is a classic 'oops' moment. Think of the ς as a shield. The subject needs a shield to do the work. The object is relaxed and doesn't need one.
Sometimes learners get confused with names. They think names don't change. But in Greek, names are nouns too. Ο Πέτρος becomes τον Πέτρο. If you forget this, your Greek friends will still love you. But they might give you a gentle correction. It is like wearing your shirt inside out. People notice, but they are usually nice about it. Just take a breath and remember the 'Drop the S' rule. It is the golden rule for masculine nouns.

Contrast With Similar Patterns

It is helpful to compare this with Neuter nouns. Neuter nouns like το νερό (the water) are easy. They stay exactly the same in both cases. Masculine nouns are more high-maintenance. They demand that you change their ending.
Also, compare it with Feminine nouns. Feminine nouns like η φίλη (the female friend) change their article to την. They also don't have an ς to drop in the Nominative. Masculine nouns are unique because of that disappearing ς.
Think of it this way:
  • Masculine: ο φίλος -> τον φίλο (Changes ending and article)
  • Neuter: το βιβλίο -> το βιβλίο (Changes nothing)
  • Feminine: η πόρτα -> την πόρτα (Changes only the article)
Masculine nouns are the most 'active' in their changes. They want you to pay attention to them. Once you get the rhythm, it feels like a song. Ο to τον, -ος to -ο. Repeat it until it feels natural.

Quick FAQ

Q

Do all masculine nouns end in -ος?

No, but a huge majority of them do. It is the most common pattern.

Q

Does the ν in τον ever disappear?

For masculine nouns, we usually keep it to avoid confusion with neuter words.

Q

Is it the same for plural nouns?

No, the plural has its own set of rules. We will save that for another day.

Q

What if I forget to drop the ς?

People will still understand you perfectly. You just sound like a beginner, which is totally okay!

Masculine Noun Case Table

Case Article Noun Ending Example
Nominative
o
-os
o filos
Accusative
ton
-o
ton filo

Meanings

This rule governs how masculine nouns function as subjects versus direct objects in a sentence.

1

Subjective

The noun performs the action.

“O anthropos trehei.”

“O filos mou erhetai.”

2

Objective

The noun receives the action.

“Vlepo ton anthropo.”

“Agapo ton filo.”

Reference Table

Reference table for Masculine Nouns ending in -os (Nominative and Accusative)
Form Structure Example
Nominative
o + -os
o anthropos
Accusative
ton + -o
ton anthropo
Negative
den + verb + ton + -o
den vlepo ton filo
Question
verb + ton + -o?
vlepeis ton filo?
Plural (Note)
oi + -oi
oi anthropoi

औपचारिकता का स्तर

औपचारिक
Vlepo ton filo.

Vlepo ton filo. (Daily conversation)

तटस्थ
Vlepo ton filo.

Vlepo ton filo. (Daily conversation)

अनौपचारिक
Ton vlepo ton filo.

Ton vlepo ton filo. (Daily conversation)

बोलचाल
Ton filo vlepo.

Ton filo vlepo. (Daily conversation)

Noun Case Map

Masculine Noun

Subject

  • o filos the friend

Object

  • ton filo the friend
पूरी व्याख्या पढ़ने के लिए मुफ़्त साइन अप करें

स्तर के अनुसार उदाहरण

1

O filos mou erhetai.

My friend is coming.

2

Vlepo ton filo mou.

I see my friend.

1

O anthropos diavazei.

The man is reading.

2

Akouo ton anthropo.

I hear the man.

1

O ypologistis einai kainourios.

The computer is new.

2

Agorasa ton ypologisti.

I bought the computer.

1

O dromos einai kleistos.

The road is closed.

2

Akolooutho ton dromo.

I am following the road.

1

O koinonikos logos einai simantikos.

Social discourse is important.

2

Analyo ton koinoniko logo.

I am analyzing the social discourse.

1

O politikos milaei.

The politician is speaking.

2

Akouo ton politiko.

I am listening to the politician.

आसानी से भ्रमित होने वाले

Masculine Nouns ending in -os (Nominative and Accusative) बनाम Plural -oi

Learners confuse singular -os with plural -oi.

Masculine Nouns ending in -os (Nominative and Accusative) बनाम Neuter -o

Neuter nouns end in -o, just like masculine accusative.

Masculine Nouns ending in -os (Nominative and Accusative) बनाम Feminine -a

Learners use masculine articles with feminine nouns.

सामान्य गलतियाँ

✗

vlepo o filos

✓

vlepo ton filo

Forgot to change article and ending.
✗

o filo

✓

o filos

Forgot the nominative s.
✗

ton anthropos

✓

ton anthropo

Kept the s in accusative.
✗

vlepo ton anthropoi

✓

vlepo ton anthropo

Confused with plural.
✗

o ton filo

✓

o filos

Mixed up articles.
✗

ton o filos

✓

ton filo

Used both articles.
✗

vlepo ton anthropo mou

✓

vlepo ton anthropo mou

Actually correct, but often overthought.
✗

o filos mou vlepei

✓

o filos mou vlepei

Correct, but check agreement.
✗

vlepo ton filos

✓

vlepo ton filo

Late-stage slip.
✗

vlepo ton anthropo

✓

vlepo ton anthropo

Correct.

वाक्य संरचनाएँ

O ___ einai kalos.

Vlepo ton ___.

O ___ diavazei to vivlio.

Real World Usage

Texting constant

O filos mou erhetai!

Ordering food very common

Vlepo ton katalogo.

Job interview common

O diefthintis einai edw.

सभी उदाहरण देखने के लिए मुफ़्त साइन अप करें
💡

Watch the Article

The article is your best friend. If you see 'ton', you know the noun must end in 'o'.
⚠️

Don't add 's' to objects

Never say 'ton filos'. It is always 'ton filo'.
🎯

Practice in pairs

Always learn the nominative and accusative forms together as a pair.

Smart Tips

Ask yourself: who is doing the action? That is the nominative.

O filos vlepo. → O filos vlepei.

Immediately switch the article to 'ton'.

Vlepo o skilos. → Vlepo ton skilo.

Check every noun ending against its article.

O filo. → O filos.

उच्चारण

o-fi-los

Final Sigma

The 's' is pronounced clearly at the end of nominative nouns.

Statement

O filos erhetai.

Falling intonation at the end.

याद करें

स्मृति सहायक

Subject is 'os', Object is 'o'. Think: 'O' for Object!

दृश्य संबंध

Imagine a man with a heavy 'S' backpack (Subject). When he becomes an object, he drops the backpack (the 'S') to run faster.

Rhyme

Subject ends in os, Object ends in o, that's the way the Greek nouns go!

Story

O filos (the friend) walks into the room. I see ton filo (the friend). He is happy to be the object of my attention.

Word Web

o filoston filoo anthroposton anthropoo skiloston skilo

चैलेंज

Write 5 sentences today: 3 with subjects, 2 with objects.

सांस्कृतिक नोट्स

Standard usage is very consistent.

Pronunciation of the final 's' can be softer.

Derived from Ancient Greek second declension.

बातचीत की शुरुआत

“

Poios einai o filos sou?

“

Vlepeis ton anthropo ekei?

“

O ypologistis sou einai kalos?

डायरी विषय

Describe your best friend.
Write about someone you see in the park.
What do you see on your desk?

सामान्य गलतियाँ

Incorrect

सही

Incorrect

सही

Incorrect

सही

Incorrect

सही

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Test Yourself

Fill in the blank.

Vlepo ___ filo.

✓ Correct! ✗ Not quite. Correct answer: ton
Accusative needs ton.
Choose the correct form. बहुविकल्पी

O ___ erhetai.

✓ Correct! ✗ Not quite. Correct answer: filos
Nominative needs -os.
Fix the sentence. Error Correction

Find and fix the mistake:

Vlepo ton anthropos.

✓ Correct! ✗ Not quite. Correct answer: Vlepo ton anthropo
Accusative drops the s.
Translate to Greek. अनुवाद

I see the friend.

Answer starts with: Vle...

✓ Correct! ✗ Not quite. Correct answer: Vlepo ton filo
Accusative case.

Score: /4

अभ्यास प्रश्न

4 exercises
Fill in the blank.

Vlepo ___ filo.

✓ Correct! ✗ Not quite. Correct answer: ton
Accusative needs ton.
Choose the correct form. बहुविकल्पी

O ___ erhetai.

✓ Correct! ✗ Not quite. Correct answer: filos
Nominative needs -os.
Fix the sentence. Error Correction

Find and fix the mistake:

Vlepo ton anthropos.

✓ Correct! ✗ Not quite. Correct answer: Vlepo ton anthropo
Accusative drops the s.
Translate to Greek. अनुवाद

I see the friend.

✓ Correct! ✗ Not quite. Correct answer: Vlepo ton filo
Accusative case.

Score: /4

अक्सर पूछे जाने वाले सवाल (6)

It changes to show its role as a subject or object.

Most do, but some end in -is or -as.

It might sound unnatural, but people will understand.

No, plural has its own rules.

No, that is grammatically incorrect.

Use the journal prompts provided.

Scaffolded Practice

1

1

2

2

3

3

4

4

Mastery Progress

Needs Practice

Improving

Strong

Mastered

अभ्यास करने के लिए मुफ़्त साइन अप करें

In Other Languages

Spanish partial

El amigo

Greek changes the noun ending, Spanish does not.

French low

L'ami

Greek is synthetic, French is analytic.

German moderate

Der Freund

German changes articles more than endings.

Japanese low

Tomodachi ga/o

Particles vs inflectional endings.

Arabic low

Al-sadiq

Prefixes vs suffix changes.

Learning Path

Prerequisites

Previous
Weak Personal Pronouns in Accusative (me, se, ton)

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