问题: 找出错处并翻译各句
找出错处并翻译各句
1.They are putting up the scaffolding.
2.You used to go swimming when you were at
college,usedn't you?
usedn't能否换为didn't
3.They fould that a stream had formed in the field.
解答:
他们正在支起脚手架.
你上大学时经常游泳,是吗? 可以改成didn't .used to 结构有两种否定形式,didn't use to ,usedn't to .
他们发现在田野里形成了一条小溪.
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