Modals
As Swan (Practical English Usage (Oxford University Press, 1997)), explains:
"One (of the meanings of modal verbs) is to do with degrees of certainty: modal verbs can be used to say for instance that a situation is certain, probable, possible or impossible. " p. 334
Examples:
You have to have a passport when you travel to the USA. (necessary)
You don't have to have a passport to travel to Bahia. (not necessary)
You can get married at the age of 21 (allowed / possible) but you can't get married earlier. (not allowed / not possible)
You should look after your clothes. (advisable)
You shouldn't walk alone at night. (not advisable)
(Most of the links cited below have more than these three modals. You may either read / practice only about them or about all of them. And this would be a bit more challenging! :-)
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1. Uses 2. Uses 3. Uses and Exercises (print) 4. Uses and Exercises (can) 5. Uses and Exercises (must/have to/need) 6. Exercise 7. Exercise (Can/Can't) 8. Exercise (Can) 9. Exercise 10. Exercise 11. USES 12. Exercise 13. Game
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14. Exercise 15. Uses (can) 16. Uses (must / have to) 17. Uses (should) 18. Exercise 19. Exercise 20. Listening 21. Exercise 23. Exercise (print) 24. Exercise (print) 26. Exercise 27. Exercise
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