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1、动词变化形式不规则动词的过去式、过去分词和部分动词的现在分词/动名词形式在学习语法提高写作能力中意义重大，在学习过程中必须充分重视，总结规律，勤于记忆。一、不规则动词的过去式和过去分词形式：1．AAA型：cut-cut-cut;read-read-read2．ABB型：teach-taught-taught;bring-brought-brought;bleed-bled-bled3．ABC型：eat-ate-eaten;break-broke-broken;write-wrote-written4．ABA型：run-ran-run;come-came-
2、come5．AAB型：beat-beat-beaten二、部分动词的现在分词/动名词形式：1．以重读闭音节结尾，末尾只有一个辅音字母，双写这个辅音字母再加ing:cut-cutting;shop-shopping;sit-sitting,nod-nodding;请注意：open-opening;limit-limiting;credit-crediting2．以er/ir结尾的动词，若er/ir所在音节重读则双写r,否则不双写，此规则亦适用于规则动词的过去式和过去分词变化。prefer-preferring-preferred;refer-referri
3、ng-referred;infer-inferred-inferring;stir-stirred-stirring3．以ie结尾的几个动词，把ie变为y再加ing:lie-lying;tie-tying;die-dying;vie-vying;请注意：dye-dyeing4．以ic结尾的动词因读音问题需加-king:panic-panicking;traffic-trafficking;picnic-picnicking注意：此类动词变过去式和过去分词时加-ked.三、注意事项：1.有些双音节词变成过去式、过去分词和现在分词时，英国人习惯双写最后一个辅
4、音字母，而美国人则不双写。如：travel-travelling-travelled(英)travel-traveling-traveled（美）;kidnap-kidnapping-kidnapped,kidnap-kidnaping-kidnaped这样的词还有：dial,equal,quarrel,cancel,model,label,fuel,refuel等。2.以-ee结尾的动词，直接加-ing:agree-agreeing;see-seeing3.少数动词的过去式和过去分词均有两种形式，可以通用，如：quit-quitted,quit;bet
5、-betted,bet;rid-ridded,rid;knit-knitted,knit;wet(弄湿)-wetted,wet;bid(吩咐，招标)-bid,bade61.少数动词的过去式和过去分词有英美两种拼法英国拼法以-t结尾，美国拼法则以-ed结尾。如：burn-burnt-burnt(英);burn-burned-burned(美);lean-leant-leant;lean-leaned-leaned;dream-dreamt-dreamt;dream-dreamed-dreamed;learn-learnt-learnt;learn-lear
6、ned-learned;leap-leapt-leapt;leap-leaped-leaped;spell-spelt-spelt;spell-spelled-spelled;spill-spilt-spilt;spill-spilled-spilled;smell-smelt-smelt;smell-smelled-smelled四、练习1．写出下列不规则动词的过去式、过去分词和现在分词。1．AAA型6原形过去式过去分词现在分词bet__________________________bid__________________________broad
7、cast__________________________burst__________________________cast__________________________cost__________________________cut__________________________hit__________________________hurt__________________________let__________________________put__________________________原形过去式过去分词现在分词
8、quit__________________________read______
