Ability: http://www.perfect-english-grammar.com/modal-verbs-of-ability.html
Obligation: http://www.perfect-english-grammar.com/modal-verbs-of-obligation.html
Possibility: http://www.perfect-english-grammar.com/modal-verbs-of-probability.html
Espero que os ayuden, ¡ánimo y a estudiar!
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