The comparative degree is formed by:

1. Adding -er to one-syllable adjectives

Examples:

• tall - taller

• short - shorter

2. Adding -r to one-syllable adjectives that end in -e

Examples:

• brave - braver

• fine - finer

3. Writing the last consonant twice and then adding -er for adjectives with a single short vowel ending in a single consonant

Examples:

• big - bigger

• fat - fatter

4. Changing y to i then adding -er to adjectives that end in -y

Examples:

• funny - funnier

• busy - busier