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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:

2. used to do 表示 过去常常做的事情,used to的反义疑问应该用didn't,因此应该改为
You used to swim when you were at college,didn't you?