Choose the correct answer about the meaning of the modal forms in the following sentences

1. May I use your mobile phone? Asking for advice Asking for permission Making a suggestion
2. May I help you? Asking for advice Asking for permission Making an offer
3. You mustn't walk on grass. Expressing prohibition Expressing obligation Expressing lack of necessity
4. What do you think I should do? Asking for advice Asking for permission Making an offer
5. Can you help me with this exercise? Asking for advice Asking for permission Making a request
6. I can speak Arabic. Expressing possibility Expressing obligation Expressing ability
7. I think you should see a doctor. Expressing probability Giving advice Making a request
8. You must stop when the traffic lights are red. Expressing prohibition Expressing obligation Expressing ability
9. You needn't take your umbrella. It isn't raining. Expressing prohibition Expressing obligation Expressing lack of necessity
10. You may pass the exam. It is not very difficult. You only have to work harder. Expressing prohibition Expressing obligation Expressing possibility