1. We often visit our friends. We don't often visit our friends.
2. My sister usually reads English books on Saturdays. My sister doesn't usually read English books on Saturdays.
3.I always answer or letters. I don't always answer or letters.
4. Our teaher speaks English very well. Our teaher doesn't speak English very well.
5. This doctor works in a big factory. This doctor doesn't work in a big factory.
6. Mary and I live in the nice, big house. Mary and I live don't live in the nice, big house.
7. Our children often go for a walk to that park. Our children don't often go for a walk to that park.
8. Ann and Nick work at the same factory. Ann and Nick don't work at the same factory.
9. Her elder son comes home from school at 2 o'clock. Her elder son doesn't come home from school at 2 o'clock.
10. They often borrow books from the public library. They don't often borrow books from the public library.
11.George as a rule stays at university till 7 o'clock in the evening. George as a rule doesn't stay at university till 7 o'clock in the evening.
12. At eleven o'clock my parents listen to the news on the radio and they go to bed. At eleven o'clock my parents don't listen to the news on the radio and they don't go to bed.