MUST

1. obligation

1.1. E.g. You must talk to your daughter about her future

1.2. E.g. Must he do it himself?

2. prohibition

2.1. E.g. He must not leave his room for a while

3. emphatic advice

3.1. E.g. You must come and see us when you are in London

3.2. E.g. You must stop worring about your son

4. supposition implying strong probability

4.1. E.g. He must be ill. He looks so pale

4.2. E.g. It must be late as the streets are deserted

5. Additional material

5.1. obligation

5.1.1. (in different contex) duty or necessity

5.1.2. with dinamic verbs

5.1.2.1. E.g. Jane must read the book

5.2. supposition

5.2.1. stative verbs

5.2.1.1. E.g. He must be over fifty

5.3. set phrases

5.3.1. a) must needs

5.3.1.1. E.g. He must needs go there

5.3.2. b) must be going and must be off

5.3.3. c) must tell you that.../ must say...