1、2单元没有，3、4单元有哦。 第三单元：watch----watched wash---washed clean---cleaned play---played visit---visited do---did cook---cooked go---went go swimming---went swimming read---read go fishing---went fishing go hiking---went hiking study---studied swim---swam 第四单元 learn---learned sing---sang dance---danced eat---ate take---took climb---climbed have---had buy---bought row---rowed see---saw go skiing---went skiing go ice-skating---went ice-skating leave---left get---got
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