Mongolian noun cases dictate exactly how words function within a sentence.

They’re essential for understanding who is doing what to whom.

Instead of using standalone prepositions like we do in English, Mongolian attaches specific suffixes to the ends of nouns.

There are exactly seven noun cases in the Mongolian language.

Vowel harmony determines the exact spelling of the suffix you need to attach.

Mongolian suffixes change their vowels to naturally match the vowels that already exist in the root word.

I’ll break down each of the seven cases below with simple rules and clear examples.

Nominative case (base form)

The nominative case is simply the dictionary form of a noun.

It’s the basic form of a word before any extra suffixes are added.

You use this case when the noun is the main subject of the sentence.

There are no suffixes to memorize for the nominative case.

Genitive case (possession)

The genitive case shows possession or ownership.

It translates directly to the English words “of” or the apostrophe-s (‘s).

You add this suffix to the noun that acts as the owner.

Here’s an example showing how “father” (аав) becomes “father’s” (аавын).

Accusative case (direct object)

The accusative case marks the direct object of a sentence.

It highlights the exact noun that is receiving the action of the verb.

You use this case when you’re talking about a specific, known object.

Here’s an example showing how “book” (ном) receives the action of being read.

Dative-locative case (location and direction)

The dative-locative case combines two concepts into one suffix.

It shows where something is located (in, at, on) or the direction something is moving toward (to).

It also acts as the indirect object in a sentence.

Here’s an example of moving toward a “school” (сургууль).

Ablative case (origin)

The ablative case indicates movement away from a place or object.

It translates directly to “from” or “out of” in English.

It’s also used when comparing two different things.

Here’s an example showing movement originating from “home” (гэр).

Instrumental case (tools and methods)

The instrumental case explains the means by which an action is performed.

It translates to “by”, “with”, or “by means of” in English.

You use this case for physical tools, modes of transportation, and languages.

Here’s an example using a “pen” (үзэг) as a tool to write.

Comitative case (companionship)

The comitative case shows that an action is being done alongside someone or something else.

It simply translates to “with” in English.

Unlike the instrumental case, this is used for people, animals, or having possession of an item.

Here’s an example showing action happening alongside a “friend” (найз).

How to practice Mongolian cases

Memorizing these suffixes by reading them is a great first step.

Your brain needs constant repetition and exposure to internalize how these endings sound in conversation.

The absolute best way to master these cases is through guided practice on our platform, Talk In Mongolian.

Our courses place these exact grammar rules into realistic, everyday dialogues.

You’ll naturally absorb vowel harmony and case endings without doing tedious math in your head.