In Welsh grammar, the Nouns Theory plays a crucial role in understanding the structure and usage of nouns. Nouns are classified into two main categories: masculine and feminine. This classification, however, does not imply gender, but rather is based on certain phonetic and morphological characteristics of the nouns.

Masculine nouns generally have a singular form that ends in a consonant or a stressed vowel, while feminine nouns typically end in a non-stressed vowel sound. There are exceptions to this rule, with some nouns ending in -en or -yn, which are masculine.

In addition to classifying nouns by gender, the Nouns Theory also addresses the concept of plural forms. Welsh nouns can have regular or irregular plural forms, with various patterns depending on the noun’s gender and ending.

Understanding the Nouns Theory is crucial for learners of Welsh as it helps them identify and use nouns correctly in sentences. By mastering the theory, learners can confidently navigate the complexities of noun usage, ensuring their communication in Welsh is accurate and effective.