Negative forms 7.7. Negative forms 7.7.1. Negative forms of verbs First of all, I would like to explain the difference between verbs and adjectives in Japanese. The reason why their inflections are different is that their purposes are different.
Verbs basically represent action, and adjectives represent condition.
Doing something is action, so you use verbs for action in Japanese. Not doing something is condition rather than action, because it is not what you do. As a result, the negative forms of Japanese verbs become adjectives, which are used for condition. You have two ways to create a polite negative form of a verb. I don't like the other way, because it uses another negative suffix.