Question

why do we use adjective, verb, and noun?

Answer 1

noun are used to denote a specific thing,living or non living
verbs are used to make sentence being present past or future with there help

adjectives are used to express the qualities of noun
like we are visiting the beautiful India

Answer 2

Noun is used when we write a particular or common name of something
Verb when we denote happening or performing of an action
Adjective is used when we talk about qualities of someone or something