Comparative adjectives are used to compare two
(and only two) things. They are used with the word THAN.

STRUCTURE

Comparative adjectives are use ER or MORE.

ER
Subject + BE + Adjective + ER + Than

Examples:

The car is bigger than the bicycle.
My brother is older than me.

MORE
Subject + BE + More + Adjective + Than

Examples:

The dress is more expensive than the pants.
Her painting is more beautiful than my painting.

How do you know when to add ER or when to use MORE?
Simply follow this rule:

Here are some example sentences with comparative
adjectives:

The boy is taller than his sister.
My house is smaller than your house.
The book is more interesting than the movie.
The shoes are more expensive than the boots.

Irregular Comparative Adjectives

Some adjectives do not follow the same structure. These are
called irregular comparative adjectives.

Examples:

The chocolate ice cream is better than the vanilla ice
cream.
The green shoes are worse than the blue shoes.

Base Adjective	Add...	Example:
2 Syllables or less	ER	Tall	Taller
3 Syllables or more	MORE	Beautiful	More Beautiful

Adjective	Comparative
Good	Better
Bad	Worse

Practice comparative adjectives with these exercises:

Comparative Adjectives Tests

Comparative Adjectives Test
Comparative Adjectives Test 2
Comparative Adjectives Test 3

Comparative Adjectives Reading

Comparative Adjectives Reading