1、The children climbed a hill.2.They studied English in 1980

1.The children didn't climb a hill.
Did the children climb a hill? Yes, they did. No, they didin't.
2.They didn't study English in 1980.
Did they study English in 1980? Yes, they did. No, they didin't.
3. My father didn't buy a big ice cream.
Did your father buy an ice cream? Yes, he did. No, he didin't.
4.We didn't go to the zoo yesterday.
Did you go to the zoo yesterday? Yes, we did. No, we didin't.
5.She wasn't nine last year.
Was she nine last year? Yes, she was. No, she wasn't.