Decide whether the following sentence have the same (s) or different (d) meanings. Please type "s" or "d".

1. He could be late tonight. / He must be late tonight.
2. He could be at the library. / He might be at the library.
3. We should call Mary. / We ought to call Mary.
4. You have to clean your room. / You must clean your room.
5. I may go to the mall. / I could go to the mall.
6. You should not pay for your classes today. / You must not pay for your classes today.
7. He may be at the library. / He could be at the library.
8. We have to register early. / We might register early.
9. You must not smoke in an airplane. / You had better not smoke in an airplane.
10. Eating healthy can help you lose weight. / Eating healthy should help you lose weight.
11. We have to register today. / We should register today.
12. He cant be home already. / He might not be home already.
13. She couldnt have finished already. / She could have finished already.
14. He will register early. / We is going to register early.
15. He must be from Italy. / He couldnt be from Italy.