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was 是
were 是
wasn’t不是
weren’t不是
did 助动词
didn’t 没有
1.What did Sam and Amy do
last Sunday?
They had a picnic.
2.How did they go there?
They went there by bus.
They saw some birds.
They ate some food.
They drank some drinks.
原形
have/has
go
see
sing
drink
give
eat
take
make
过去式
had 有，度过
went去
saw看
sang唱歌
ate吃