Understanding Welsh verb conjugation rules is highly logical once you grasp the foundational patterns.

You’ll also notice different tenses and regional variations across Wales.

This guide breaks down exactly how to conjugate Welsh verbs in a clear and structured way.

You’ll learn the difference between using helper verbs and changing verb endings.

I’ll also explain how these rules change depending on whether you’re in North or South Wales.

Understanding the Welsh verb-noun

Before you can conjugate anything in Welsh, you need to understand the concept of a verb-noun.

In English, we use infinitives like “to run” or “to eat”.

In Welsh, these base forms are called verb-nouns (berfenwau) because they act as both a verb and a noun.

For example, the word rhedeg means “to run” but it also translates to the act of “running”.

You’ll use these base verb-nouns frequently when constructing sentences with helper verbs.

The helper verb method

The most common way to conjugate verbs in spoken Welsh is by using an auxiliary, or “helper”, verb.

Instead of changing the main verb itself, you conjugate the verb “to be” (bod) and link it to your verb-noun.

You link them using the word yn (which shortens to ‘n after a vowel).

This creates a sentence structure that literally translates to “I am in the act of doing something”.

Let’s look at the present tense conjugation of bod (to be) in both North and South Welsh.

You simply add ‘n and a verb-noun to these helper verbs to create a full present tense sentence.

The short form method

The second way to conjugate Welsh verbs is by changing the ending of the word itself.

This is called the inflected method, or the “short form”.

You’ll see this method used most often for the past tense and the future tense in spoken Welsh.

To conjugate a verb this way, you first need to find the verb stem.

You usually find the stem by dropping the last vowel or syllable of the verb-noun.

For example, the stem of canu (to sing) is can-, and the stem of yfed (to drink) is yf-.

Once you have the stem, you add the appropriate tense ending.

Here are the standard past tense endings attached to the stem can- (sing).

Notice how the main verb itself changes rather than relying on a helper verb.

Essential irregular verbs

Every language has irregular verbs that don’t follow the standard conjugation rules.

In Welsh, there are four highly irregular verbs that you must memorize.

These are mynd (to go), gwneud (to do/make), dod (to come), and cael (to get/have).

These verbs don’t use a predictable stem for their short form conjugations.

Instead, they change entirely in the past and future tenses.

Here’s a quick look at the irregular past tense for mynd (to go).

Regional variations in conjugation

Spoken Welsh has distinct regional dialects that affect verb conjugation.

The most obvious split is between North Welsh (Gogledd) and South Welsh (De).

We already saw earlier that the present tense helper verbs differ slightly between dan ni (North) and dyn ni (South).

Another major difference appears in how people talk about the past.

In South Wales, people frequently use the short inflected form for past tense actions.

In North Wales, people often prefer using a past tense helper verb called gwneud (to do) combined with the main verb.

Both of these conjugation styles are completely correct and mutually understood across the entire country.