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last night/week/ time..
… days ago
On Sunday morning
一般过去时
一般过去时
am(is) →was are →were
陈述句：He was at home yesterday.
否定句：He wasn’t at home yesterday.
疑问句：Was he at home yesterday?
Yes, he was./No, he wasn’t.
陈述句：主语+动词过去式+其它
I go to the movie. →I went to the movie.
否定句：主语+助动词didn’t+动词原形+其它
I don’t go to school today. →I didn’t go to school.
一般疑问句：Did +主语+动词原形+其它?
Do you have breakfast? →Did you have breakfast?
Yes, I do./No, I don’t. Yes, I did./No, I didn’t.
Past过去
Present现在
ride a horse
feed chickens
do homework
go to a countryside
pick strawberries
milk a cow
rode a horse
fed chickens
did homework
went to a countryside
picked strawberries