Basque auxiliary verbs are essential for understanding how sentences are built.

They carry the most important grammar information in a Basque sentence.

You’ll use them to show who is doing the action, who is receiving it, and when it happens.

The two most fundamental auxiliary systems you must learn are NOR and NOR-NORK.

What are Basque auxiliary verbs?

In Basque, most verbs are compound verbs.

This means they consist of two separate words working together.

The first word is the main verb which tells you the actual action being performed.

The second word is the auxiliary helper verb.

This auxiliary verb changes based on the subject, the object, and the tense of the sentence.

Instead of changing the main verb for every person like you do in Spanish or French, you only change this short auxiliary helper.

The NOR system (intransitive verbs)

The NOR system is strictly used for intransitive verbs.

Intransitive actions are things you do that don’t affect a direct object.

Examples of these actions include walking, sleeping, arriving, or simply existing.

In this system, the subject is in the absolutive case, which Basque grammar refers to as NOR (Who/What).

The auxiliary verb used for the NOR system is based on the verb izan, which means “to be”.

Here’s the present tense auxiliary table for the NOR system:

The NOR-NORK system (transitive verbs)

The NOR-NORK system is used for transitive verbs.

Transitive actions are things you do that directly affect a receiving object.

Examples include eating an apple, reading a book, or seeing a friend.

In this system, the doer of the action takes the ergative case, which is called NORK (Who did it).

The subject in the NORK case is always marked with the letter “k” at the end of the word.

The object receiving the action stays in the absolutive case (NOR).

The auxiliary verb used here is based on the verb edun or ukan, which roughly translates to “to have”.

Here’s the present tense auxiliary table for a subject acting on a single object (like “I have it”):

Depending on where you are in the Basque Country, you’ll hear regional variations of these specific verbs.

For example, in the Bizkaian dialect, you’ll frequently hear dot instead of dut for “I have it”.

Examples of NOR vs NOR-NORK

Let’s look at how the subject and the auxiliary verb change depending on the system.

We’ll use the intransitive verb joan (to go) and the transitive verb jan (to eat).

First, here’s a sentence using the NOR system.

Notice that the subject is simply ni and the helper verb is naiz.

Next, here’s a sentence using the NOR-NORK system.

Notice how ni changes to nik because an action is being physically done to an object.

You can also see that the auxiliary verb switches from naiz to dut.

Here’s another comparison using the third person.

The subject hura changes to hark to show she’s the one actively reading the object.

Learning the difference between these two systems is the foundation of Basque grammar.

Once you understand these two tables, building your own Basque sentences becomes straightforward.