1. Can be counted as one or more. Ex : pen, computer, bottle etc.
2. Take an s to form the plural. Ex : pens, computers, bottles etc.
3.Work with expressions such as (a few, few, many, some, every, each, these, and the number of).Ex : a few pens,some spoons, every desk, each cup, these televisions, the number of chair setc.
4. Work with appropriate articles (a, an, or the).Ex : a pen, the computer, an Umbrella etc.