1. you don't write to them every day
2. he doesn't live in this house
3. i don't keep it in my pocket
4. i don't work on the tenth floor
5. john doesn't speak english well
6. mary doesn't speak better than john
7. peter doesn't come to class ten minutes late
8. we don't use many books during our lesson 
9. she doesn't give me the book
10. i don't understand anything

1. do you write to them every day?
2. does he live in this house?
3. do i keep it in my pocket?
4. do i work on the tenth floor?
5. does john speak english well?
6. does mary speak better than john?
7. does peter come to class ten minutes late?
8. do we use many books during our lesson?
9. does she give me the book?
10. do i understand anything?

1. You do not write to them every day.
2. He does not live in this house.
3. I do not keep it in my pocket.
4. I do not work on the tenth floor.
5. John does not speak English well.
6. Mary does not speak better than John.
7. Peter does not come to class ten minutes late.
8. We do not use many books during our lesson.
9. She does not give me the book.
10. I do not understand everything.
1. Do you write to them every day?
2. Does he live in this house?
3. Do I keep it in my pocket?
4. Do I work on the tenth floor?
5. Does John speak English well?
6. Does Mary speak better than John?
7. Does Peter come to class ten minutes late?
8. Do we use many books during our lesson?
9. Does she give me the book?
10. Do I understand everything?