b88eb70a_uperlatives___ESL_Vietnam_Zone__Adjective
[Comparative] Bigger [How to form comparatives] If the adjective finishes in one vowel + one consonant then form the comparative form by doubling the final consonant and adding -er [Adjective] 
Big
S h o r t
B i g
B u s y
R e l a x e d
G o o d
B a d
F a r
Comparative adjectives, comparative adverbs and Superlatives « ESL Vietnam Zone
Adjective