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1、avoid的过去式与过去分词都是加-ed,avoided动词过去式和过去分词有规则变化和不规则变化两种一、规则变化:一般在动词原形后加-ed 如: look looked2、以-e结尾的动词加-d 如:move moved3、以辅音字母加y结尾的动词,变y为i,再加-ed。
2、如:study studied、carry carried 4、以原音字母加y结尾的词,直接加-ed。
3、如:Play played 、enjoy enjoyed5、末尾只有一个辅音字母的重读闭音节词,双写该辅音字母,再加-ed。
4、如:Stop stopped、plan planned 6、以-r音节结尾的词,双写r字母,再加-ed。
5、如:Prefer preferred、refer referred二、不规则变化英语中有些动词的过去式和过去分词形式变化不规则:1.动词原形、过去式和过去分词完全同形。
6、(AAA型)例:cost(花费) cost cost cut(割) cut cut hit(打) hit hit hurt 伤害) hurt hurt let(让) let let put(放) put put read (读) read read 2.过去式与过去分词完全同形(ABB型)例:mean(意思是) meant meant catch(抓住) caught caught teach(教) taught taught bring(带来) brought brought fight (战斗) fought fought buy(买) bought bought think(想) thought thought hear (听见) heard heard sell(卖) sold sold 3.动词原形与过去分词同形(ABA型) become(变成) became become come(来) came come run(跑) ran run 4.动词原形、过去式、过去分词形式完全不同。
7、(ABC型)begin(开始) began begun drink(喝) drank drunk ring(铃响) rang rung sing (唱) sang sung swim(游泳) swam swum 提示:a. beat的过去式与原形同形:比:beat(打击) beat(过去式) beaten(过去分词)b. lie有规则变化和不规则变化两种,含义不同比:lie lied, lied(说谎)lay, lain(躺,位于)c. hang 有规则变化和不规则变化两种,含义不同比:hang hanged, hanged(处绞刑)hung, hung(挂,吊)d. welcome(欢迎)一词是规则动词,不可误用为不规则动词比:welcome welcomed, welcomed(正)welcome, welcome(误)e.不要将不规则动词误用为规则动词比:hit(打) hit, hit(正)hitted, hitted(误)。
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