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动词过去式详解
动词的过去式的构成规则有：
A、规则动词
①一般直接在动词的后面加ed如worked , learned , cleaned , visited
②以e结尾的动词直接加d如lived , danced , used
③以辅音字母加y结尾的动词要改y为i再加ed(此类动词较少)如study studied carry carried worry worried (play、stay)
④ 双写最后一个字母(此类动词较少)如stopped
B、不规则动词(此类词并无规则，须熟记)小学阶段要记住以下动词的原形和过去式：sing sang , eat ate , see saw , have had , do did , go went , take took , buy bought , get got , read read ,fly flew , am/is was ,
are were , say said , leave left , swim swam , tell told , draw drew , come came , lose lost , find found , drink drank , hurt hurt , feel felt