LET'S PRACTISE!
http://www.perfect-english-grammar.com/modal-verbs-of-ability-exercise-1.html
http://www.learnenglish-online.com/grammar/modals/tests/modalability.html
http://www.tinyteflteacher.co.uk/learning-english/grammar/exercises/modal-verbs-ability.html
http://random-idea-english.blogspot.com.ar/2011/02/modals-plus-talking-about-ability-can.html
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