Adjectives are words that describe nouns. They have the same form in both singular and plural.
What a rainy day!
These are friendly dogs.
Adjectives can be formed from two or more words:
This is Peter’s five-year-old son.
Attributive adjectives normally come before a noun:
Fay likes tasty food and quiet restaurants.
Predicative adjectives are separated from the noun and come after verbs like be, become, get, feel, seem, look, sound, taste, etc.
The soup tastes delicious.
The exam was easy.
Proper adjectives are derived from nouns and have to be written with a capital letter.
I watched an Italian film last night.
Jane Austin lived in the Victorian England.