1 They lived last summer in the country.
2 They didn't live last summer in the country.
3 Where did they live last summer?
4 I helped father yesterday.
5 I didn't help father yesterday.
6 Did I help father yesterday?
7 How did you help father yesterday?
8 We clean room every day.
9 We are cleaning room now.
10 We cleaned room yesterday.
11 She doesn't eat ice cream every day.
12 She isn't eating ice cream now.
13 She didn't eat ice cream yesterday.
14 What does your brother do every day?
15 What is your brother doing now?
16 What did your brother do yesterday?