walked
动词过去式变化规则：
1．一般在动词末尾加-ed，如：pull-pulled, cook-cooked
2．结尾是e加d，如：taste-tasted
3．末尾只有一个元音字母和一个辅音字母的重读闭音节，应双写末尾的辅音字母，再加-ed，如：stop-stopped
4．以“辅音字母+y”结尾的，变y为i， 再加-ed，如：study-studied
5．不规则动词过去式：
am,is-was, are-were, do-did, see-saw, say-said, give-gave, get-got, go-went, come-came, have-had, eat-ate, take-took, run-ran, sing-sang, put-put, make-made, read-read, write-wrote, draw-drew, drink-drank, fly-flew, ride-rode, speak-spoke, sweep-swept, swim-swam, sit-sat ...
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