The Verbs Theory in Welsh Grammar is a fundamental aspect of understanding how verbs function in the Welsh language.

According to this theory, verbs in Welsh can be categorized into two main groups: weak verbs and strong verbs. Weak verbs are those that undergo various changes in their forms depending on the tense and mood, while strong verbs remain relatively unchanged.

In addition to this, verbs in Welsh also have different forms depending on whether they are used in the affirmative or negative form, as well as in the singular or plural form. These forms are known as mutations, and they play a crucial role in constructing proper sentences in Welsh.

Another important aspect of the Verbs Theory is the concept of verbal nouns, which are formed by adding specific endings to the base form of a verb. Verbal nouns can act as nouns in sentences and have their own set of mutations.

Overall, understanding the Verbs Theory in Welsh Grammar is essential for learners to grasp the complex system of verb usage in the Welsh language.