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I watched a film yesterday.
对现在正在做什么提问： What are you doing？（你在做什么？）
回答： I am singing and dancing.
对过去的时间做什么提问： What did you do yesterday？（你昨天在做什么？）
对经常做什么提问： What do you often do？（你经常做什么？）
回答： I sang and danced yesterday.
回答： I often sing and dance at home.
动词过去式变化规则：
1对于大部分动词，原型动词 + ed 即可构成过去式。want—wanted wash —washed
play —played help—helped
2对于原型动词词尾有“e”的。直接 原型动词 + d 构成过去式。dance —danced love—loved
3 “辅+元+辅”结尾， 且须重读，双写末尾字母+ed构成过去式。
stop —stopped plan —planned
4词尾为“辅音+y”的动词，改“y”为“i”，+ ed
cry —cried study —studied
worry —worried
不规则变化
有些动词过去式的变化规律不明显，只能通过背诵记忆
have—had do—did sing—sang
go—went read—read swim—swam
run—ran draw—drew fly –flew
eat—ate see—saw am/is—was
are—were come—came buy—bought
ride—rode
What are you doing？ I am drawing a picture.
What did you do？ I drew a picture.
What do you like to do？ I like to draw a picture.
What are you doing？ I am dancing.
What do you often do？ I often dance after school.
What did you do？ I danced last night.