It's time to practise Modal verbs. Good luck!
http://www.englishpage.com/modals/modalintro.html
http://www.nonstopenglish.com/allexercises/grammar/grammar-modal_verbs.asp
http://www.autoenglish.org/modalverbs.htm
http://www.e-grammar.org/modal-verbs-can-may-must/
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