...................???

+ Nova wrote a letter an hour ago
- Nova didn't write a letter an hour ago

- My brother didn't sleep in the sofa last night
? Did my brother sleep in the sofa last night?

+ My sister was happy yesterday
? Was my sister happy yesterday?

- My family didn't visit my grandparents last month
? Did my family visit my grandparents last month

1. + Nova wrote a letter an hour ago
- Nova didn't write an letter an hour ago

2. - my brother didn't sleep in the sofa last night
? did my brother sleep in the sofa last night?

3. + my sister was happy yesterday
? was my sister happy yesterday?

4. - my family didn't visit my grandparents last month
? did my family visit my grandparents last month?