Countable nouns are easy to recognize. They are things that we can count. For example: "pen". We can count pens. We can have one, two, three or more pens.

Here are some more countable nouns:
1. dog, cat, animal, man, person
2. bottle, box, litre
3. coin, note, dollar
4. cup, plate, fork
5. table, chair, suitcase, bag