a) Form

1.- An adjective always has the same form. It never changes.

The funny man / The funny men

The small tree / The small trees

b) Use

1.- We use adjectives to describe nouns

Maria is a tall, young girl (The adjectives here describe what Maria is like)

2.- An adjective can go before a noun or as a complement after the noun

It is a large stadium

The stadium is large

c) Position of adjectives (OSASCOM)

1.-The order in which you put adjectives in a sentence is very important. In English there is a rule:

Opinion

Size

Age

Shape

Colour

Origin

Material

+

Noun

2.- Ejemplos:

Opinion: beautiful, ugly, etc.

Size: small, big, large, etc.

Age: old, young, etc.

Shape: round, square, etc.

Colour: red, blue, green, yellow, etc.

Origin: Spanish, Dutch, American, etc.

Material: glass, paper, wood, etc.