Comparative adjectives/adverbs

Comparative adjectives
Adjective	Comparative	Adds & changes
short	shorter	one syllable: +er
big	bigger	one vowel + one consonant: double final consonant
busy	busier	consonant +y: y +ier
relaxed	more relaxed	two or more syllables: more + adjective
good bad far	better worse further	Irregular

Comparative adverbs
Adverb	Comparative	Adverb	Comparative
Regular		Irregular
quickly	more quickly	hard	harder
slowly	more slowly	well	better
		badly	worse

Use comparative adjectives to compare people and things. My brother's shorter than me.
Use comparative adverbs to compare actions. He runs more slowly than me.
You can also use (not) as + (adjective/adverb) + as. I'm not as shorter as my brother.