精选优质文档-倾情为你奉上派生法（derivation）: 在词根前面加前缀或在词根后面加后缀，从而构成一个与原单词意义相近或相反的词。 前缀(prefix): 一般改变意义，不改变词性。 表示否定的： dis-, like-dislike, appear-disappear, agree-disagree,cover-discover, il-, legal-illegal, literate-illiterate；im-, possible-impossible, polite-impolite,mortal-immortal;in-, correct-incorrect, direct-indirect, complete-incomplete;ir-, regular-irregular, relative-irrelative, revocable-irrevocable, of being ; able to be , revoke: (transitive) to
