部分双音节形容词、多音节形容词的比较级在词前加more.例如：
ethletic(more ethletic) serious (more serious) unhapply (more unhapply)
outgoing (more outgoing) popular (more popular)
最高级与比较级的变化规则一致,不过要加most.例如：
ethletic(most ethletic) serious (most serious) unhapply (most unhapply)
outgoing (most outgoing) popular (most popular)