Basque noun cases shape how words interact within a sentence.

Instead of using separate prepositions like “to,” “for,” or “in”, Basque adds short suffix endings directly to the noun.

This word-building system is known as agglutination.

Many learners quickly hear about the famous ergative case, but Basque relies on several other important cases every day.

Understanding these simple word endings will help you structure correct sentences.

I’ll explain the most common Basque noun cases using clear examples.

What exactly are Basque noun cases?

Noun cases tell you the grammatical role of a word in a sentence.

English uses word order and extra words to show who is doing what.

Basque simply attaches a specific letter or syllable to the end of a noun.

These endings change depending on whether the noun is singular, plural, or indefinite.

Each case corresponds to a specific question word in Basque, which makes memorizing them much easier.

The absolutive case (nor)

The absolutive case answers the question nor? (who/what?).

This is the most basic, default form of a Basque noun.

You use the absolutive case for the subject of an action that doesn’t have a direct object.

These are known as intransitive verbs, like sleeping, going, or arriving.

The singular suffix is -a and the plural suffix is -ak.

You also use the absolutive case for the direct object of a sentence.

The ergative case (nork)

The ergative case answers the question nork? (who does it?).

This case is unique to Basque and is used for the subject of a transitive verb.

A transitive verb is an action that involves a direct object, like eating, seeing, or buying.

The subject performing this action must take the ergative ending.

The singular suffix is -ak and the plural suffix is -ek.

The dative case (nori)

The dative case answers the question nori? (to whom?).

You use this case to show the indirect object of a sentence.

This marks the person or thing that receives something.

The singular suffix is -ari and the plural suffix is -ei.

The possessive genitive case (noren)

The genitive case answers the question noren? (whose?).

This case indicates ownership or possession.

It functions exactly like adding an apostrophe and an “s” (‘s) in English.

The singular suffix is -aren and the plural suffix is -en.

The locative case (non)

The locative case answers the question non? (where?).

Basque has multiple location-based cases, but the basic inessive case shows where something is located.

It translates to “in”, “on”, or “at” in English.

The singular suffix is -an and the plural suffix is -etan.

Basque noun case summary

It helps to see all of these endings side-by-side.

I’ve created a simple chart using the Basque word txakur (dog) as the root noun.

Here’s a summary table of the five most common Basque cases.

Once you memorize the question words alongside the endings, sentence building becomes entirely logical.