Explanation of the author's (may Allah have mercy on him) statement: "… Chapter of Verbs …"

The Shaykh : The author (may Allah have mercy on him) said: "Chapter of Verbs". We have previously mentioned that he said at the beginning of the book: "And its parts are three: a noun, a verb, and a particle". As for the verb, here he said: "Chapter of Verbs". Why did he use the plural here and the singular there? The answer is: he used the singular there because the intended meaning is the genus, and he used the plural here because the intended meaning is the species. Here, he will mention the types of verbs, whereas there, he only intended to mention the genus. The genus, which is the verb, encompasses all the types. Do you understand, everyone? I think you know the difference between the genus and the species. What is valid to be predicated of the other, but not vice versa, is the genus. This is the rule. And what is not valid to be predicated of the other is what? The species. What is valid to be predicated of the other is the genus, and what is not valid is the species.