In Welsh grammar, the Adjectives Theory plays a crucial role in understanding and using adjectives effectively. Adjectives in Welsh come after the noun and agree with it in gender, number, and case. This means that the form of the adjective changes depending on these factors.

In feminine singular, the adjective takes the form of either soft mutation or aspirate mutation. Soft mutation occurs when the adjective follows a feminine singular noun, while aspirate mutation occurs when the adjective follows a feminine singular noun with the definite article “y” or “yr.”

In masculine singular, the adjective undergoes aspirate mutation when following a noun with the definite article “y” or “yr.” However, it does not mutate when following a masculine singular noun without the definite article.

In plural form, the adjective undergoes soft mutation when following a plural noun, regardless of gender. This mutation does not occur when the adjective follows a plural noun with the definite article.

Understanding the Adjectives Theory is essential for Welsh learners to use adjectives correctly and concisely, ensuring clear and accurate communication in the Welsh language.