Adjectives are used ro give us more information about nouns.
A green chair. - Green is an adjective, it gives us more information about the noun, chair.
Adjectives are also used to modify pronouns. For example, It's the green one. Here the pronoun is 'one'.
We have to be careful when nouns are used in place of adjectives to give us more information about a noun. Compare these three sentences:
It's a house. - house is a noun.
It's a big house. - big is an adjective.
It's a family house.- family is a noun. This means there are two nouns in this sentence. The first one gives us more information about the second.
Read through these ten sentences and decide if a noun or adjective is needed: