Adjective

Adjectives are describing words. Large, grey, and friendly are all examples of adjectives. In the examples below, these adjectives are used to describe an elephant.

Examples:

Large elephant

Grey elephant

Friendly elephant

Adjectives Modify Nouns - The rusty nail he stood on was the cause of the infection.Please put the old documents in the shredder.
Peter guessed the right number.

Adjectives Modify Pronouns -
It is a blue one.(In this example, the adjective blue modifies the pronoun one.)

 

The Different Types of Adjectives - 

Possessive adjectives - They are used to show possession. They are my, your, his, her, its, our and their. (They are a type of possessive pronoun.)

The Articles - The words a, an, and the are known as articles. They are classified as adjectives. A and an are called the indefinite articles because they are used to indicate non-specific people or things. The is called the definite article because it does indicate a specific person or thing. Ex - A cup (i.e., any cup); The cup (i.e., a specific cup)

Demonstrative Adjectives - Demonstrative adjectives are used to demonstrate or indicate specific things. This, that, these and those are all demonstrative adjectives.
Ex - Medals will only be given to those runners who complete the marathon in less than 8 hours. (Those is a demonstrative adjective. It refers to specific people.)

Indefinite Adjectives - Unlike demonstrative adjectives, which indicate specific items, indefinite adjectives do not point out specific things. They are formed from indefinite pronouns. The most common indefinite adjectives are no, any, many, few and several.
Ex - The chief has heard many people make the same promise. (The indefinite adjective many modifies the noun people.) 

Numbers - All we could muster was 9 cans of beans. (The adjective 9 modifies the noun cans.)