5 Rewrite the sentences using the modals could, must, ought to, can't, needn't. It's not necessary for you to join the charity - you can still make a donation. You 2 I'm sure he isn't at school today - he has an appointment with the doctor. He It's a good idea to get plenty of sleep the night before an exam. You 3 4 She was able to read when she was four years old. She We are obliged to help people in need - it's our duty. 5

Doing sports have a lot of advantages. First of all, doing sport helps  keep fit and be more healthy. Sport is a wonderful kind of hobby. It is not only useful but also funny. Team sport games like football or basketball teach us how important to work together to succeed. Sport helps people to rest after work and be more energetic. People who do sports regularly avoid stress. Doing sports with friends and members of family is a  good way to spend time together. I strongly recommend to do sports to stay healthy and beautifulfor a long time.