Here are the completed sentences with the correct form of "have":

1. Afua **doesn't have** a coat and she's cold! (-)
2. My friends and I **don't have** English classes on Sundays. (-)
3. My mother **has** a new phone. (+)
4. I **have** a brother. (+)
5. Akim **doesn't have** a blue school bag. (-)
6. My dad **has** glasses. (+)
7. She **has** a brother and a sister. (+)
8. We **have** a new car. (+)
9. They **don't have** grandchildren. (-)
10. Sarah **doesn't have** a coat. (-)