1. We managed to get a good grade in English
2. Prohibition
2.1. Mustn't
2.1.1. You mustn't open it before midnight
2.2. Don't have to
2.2.1. You don't have to do it all by yourself
3. Permission
3.1. Can
3.1.1. Can I open the window?
3.2. Could
3.2.1. Could we visit the park?
3.3. May \ Might
3.3.1. We may open the door
4. Ability, Possibility
4.1. Can
4.1.1. I can play football
4.2. Could
4.2.1. I could play the piano
4.3. Be able to
4.3.1. I'll be able to speak English
4.4. Managed to
4.5. Succeeded in
4.5.1. They succeeded in getting the job
5. Advices
5.1. Should
5.1.1. You should visit a doctor
5.2. Had better
5.2.1. You'd better listen to us
5.3. Ought to
5.3.1. You ought to try these pastries
6. You must drive slower
7. Must
8. Deduction
8.1. Must
8.1.1. He got promoted, he must be happy
8.2. Can't
8.2.1. He got promoted, he can't be sad
8.3. Could
8.3.1. He got promoted, he could still be at work
8.4. May \ Might
8.4.1. He got promoted, he may not be poor anymore
9. Obligation
9.1. Need
9.1.1. You need to change your tires
9.2. Have to
9.2.1. You have to drive in your lane
10. Requests
10.1. Can
10.1.1. Can you give that pen?
10.2. Could
10.2.1. Could you listen to them?
10.3. Will
10.3.1. Will you come with us?
10.4. Would
10.4.1. Would it be that bad to do as they say?