1、前缀 例词 派生词un-“不” happy unhappy like unlike usual unusual friendly unfriendly im-“不” possible impossible后缀 例词 派生词-er“人” teach teacher play player clean cleaner drive driver(以e结尾,-r) run
2、 runner(重读闭音节,双写-er) win winner travel traveller-or“人” invent inventor visit visitor-ly(副词后缀) bad badly quick quickly careful carefully happy happily deep deeply lucky luckily usual u
3、sually noisy noisily slow slowly angry angrily strong strongly quiet quietly 特例:true truly terrible terribly possible possibly-ful(形容词后缀)care careful help helpful use useful for