You, what are you doing?

That person is my friend.

Learning about the culture of specific Asia is very interesting.

It is important for each person to fulfill their role.

He is learning how to use gerunds.

A common noun refers to a noun that does not point to a specific person or thing.

What is his real name?

Abstract nouns, unlike nouns that refer to concrete things, refer to concepts or states that do not have a specific shape or color.

He is learning how to use collective nouns.

'Apple' is a count noun, and you can count it as one, two, etc.