The masen form is a negative verb conjugation in the Japanese language. It is used to express actions that do not occur or are not performed. For example, the verb taberu (to eat) becomes tabemasen (do not eat) in its negative form. This structure is commonly used in both formal and polite conversations. To create the masen form, you typically take the masu form of a verb and replace the masu ending with masen. This conjugation is essential for effective communication in Japanese, allowing speakers to convey negation clearly and respectfully.