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，
5．不规则动词过去式：
am,is-was are-were do-did
get-got go-went come-came
run-ran sing-sang put-put make-made
draw-drew drink-drank fly-flew
swim-swam sit-sat
再加-ed，如：study-studied see-saw say-said give-gave have-had eat-ate take-took read-read write-wrote ride-rode speak-spoke sweep-swept
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