Here's why:
* Nouns are either singular or plural: "Special nouns" aren't a separate noun category. They are simply nouns that have specific meanings or uses. For example, "country" is a special noun because it refers to a specific type of political entity. But, it can be singular ("one country") or plural ("several countries").
* Special nouns follow regular plural rules: The way you make a noun plural usually depends on its ending. For example, "countries," "cities," "mountains" all follow regular plural rules.
Let's look at some examples:
* Countries: One country, two countries
* Mountains: One mountain, two mountains
* Cities: One city, two cities
* Seas: One sea, two seas
* Rivers: One river, two rivers
* Books: One book, two books
* Days: One day, two days
If you can tell me more about the type of noun you're thinking of, I can provide more specific examples!