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【过去式的变化规则】
①一般情况下,在动词原形后直接加ed如wanted,played
②以不发音的字母e结尾的动词,直接加d如hoped,lived
③重读闭音节单词需双写最后一个辅音字母,再加ed如stoppedshipped
④以辅音字母+y结尾的动词变y为i,再加ed如studied,worried
⑤有些动词不符合上面的规则,需要特殊记忆如amis-wasare-werego-wenteat-ateSwim-swambuy-boughtsee-sawTeach-taughtbring-broughtthink-thoughtFall-fellhurt-hurtbreak-brokewin-wonLose-lost规则动词过去式加“ed”后的发音规则在浊辅音和元音后面[d]CalledborrowedMoved[mu:vd]enjoyedWelcomedanswered在清辅音后面[t]Askedfinishedhelped[helpt]passed[pa:st]Reached在[t]音后面[id]wanted[wCntid]started[sta:tid][d]音后面[id]Needed[ni:did]counted[kauntid]0清/p//t//k//f//F/s//W//tF//ts//tr/浊/b//d//g//v//V//z//T//dV//dz//dr/补充说明规则动词的过去式由“动词原形+-ed”构成,具体变化有
1.直接在词尾加-ed如:want—wantedwork—workedneed—neededclean—cleaned
2.以不发音的e结尾的在词尾加-d如like—likedlive—liveduse—usedmove—moved
3.以一个元音字母加一个辅音字母结尾的重读闭音节动词,先双写结尾的辅音字母,再加-ed如stop—stoppedtrip—tripped
4.以辅音字母加y结尾的动词,先把y变成i,再加-ed如study—studiedcar...。