How to use quantifiers

Cabbage is a real quantifier. A cabbage is also true. There is indeed a saying about a cabbage. But your colleague is a dead end, because if you are talking about quantifiers, you can't use a cabbage. One plant means many trees. You can refute your colleagues like this. Ask him first: a () person, let him fill in the quantifier, you will say: a () person, but you deliberately say a (group) person. The reason is the same. Although a group of people are correct, they are not quantifiers. The correct quantifier should be people. There is also a quantifier to describe fish: a fish, a fish, according to your colleague, it won't be a dead end: a pile of fish, a catty of fish. So you can convince him like this.