初中阶段加前后缀构成反义词归纳1.un-able-unablecomfortable-uncomfortablefair-unfairfriendly-unfriendlygrateful-ungrateful(不领情的)happy-unhappyhealthy-unhealthyhelpful-unhelpful(无帮助的)important-unimportantkind-unkindknown-unknownlucky-unluckynecessary-unnecessarypleasant-unpleasantpopular-unpopulartidy-untidyusual-unusualwelcome-unwelcome2.–lesscareful-carelesshelpful-helpless(无助的，需要帮助的)useful-uselessharmful-harmlesshopeful-hopelessmeaningful-meaninglessend-endless3.dis-honest-dishonestagree-disagreelike-dislikeappear-disappearadvantage-disadvantage4.in-correct-incorrectactive-inactive5.im-possible-impossiblepolite-impolitepatient-impatient6.ir-regular-irregular一类：加前缀-un例词：unhappyunusualungratefulunhelpfulunkind第二类：加后缀-less例词：carelesshomelesshopeless第三类：加前缀-im例词：impolite(不礼貌的)impatient（不耐心的）impossible（不可能的）第四类：加前缀-in例词：incorrect（不正确的）inactive（不活跃的）第五类：加前缀-dis例词：dishonest（不诚实的）第六类：加前缀-ir例词：irregular（不规则的）归纳：初中阶段绝大多数形容词都是加前缀-un构成其否定形式记忆起来工程浩大，比较困难。但如果我们把不是加-un前缀而是加-im,-in,-dis,-ir等前缀的这七个单词牢记的话，那么就能达到事半功倍的效果。
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