The singular and plural of kind of type of predicate Is the predicate of a kind of books or are? If it's kind of, but of is followed by a singular noun or an uncountable predicate, is it singular or plural? Is the predicate of types of the disease singular or negative?

The singular and plural of kind of type of predicate Is the predicate of a kind of books or are? If it's kind of, but of is followed by a singular noun or an uncountable predicate, is it singular or plural? Is the predicate of types of the disease singular or negative?

This phrase means a kind, so it is singular
Kind of is various, so the following is plural and the predicate is also plural
The same is true for types of the disease, which means all kinds of diseases. Then it is expressed in plural. This is to be understood as a whole, because it is a complete expression