或were调到句首。
3.句中没有be动词的一般过去时的句子
否定句：didn’t +动词原形，如：
Jim didn’t go home yesterday.
一般疑问句：在句首加did，句子中的动词过去式变回原形。如：
Did Jim go home yesterday?
特殊疑问句：⑴疑问词+did+主语+动词原形?如：
What did Jim do yesterday?
⑵疑问词当主语时：疑问词+动词过去式?如：
Who went to home yesterday?
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