1. writes
(-) My best friend doesn't write to me every week.
(?) Does my best friend write to me every week?
2. has
(-) My family doesn't have a holiday in December every year.
(?) Does my family have a holiday in December every year?
3. swim
(-) Martha and Kevin don't swim twice a week.
(?) Do Martha and Kevin swim twice a week?
4. is; tells
(-) Mike isn't humor. He doesn't always tell us funny stories.
(?) Is Mike humor? Does he always tell us funny stories?