前缀改变词义,后缀改变词性答:【前缀改变词义】例:un- centain→uncentain,fortunate→unfortunate,do→undo,fold→unfold,cover→uncover easy→uneasy,load→unload,happy→unhappy,friendly→unfriendly,like→unlike 【后缀改变词性】例:-ant apply→applicant,resist→resistant,account→accountant,assist→assistant ...