While reading a text in Japanese, I came up with the phrase "何も言わなくなったから" I don't understand what the ~くない stands for. As far as know is used as the negative for of an adjective... but 言う is a verb! ...
Generally, in all Japanese language classes, the rule you're taught is that です does not follow い adjectives. Instead, い adjectives can act like stative verbs, and as such terminate a sentence by ...