jueves, 20 de febrero de 2014

Modal verbs

http://www.englishpage.com/modals/interactivemodal1.htm

http://www.myenglishpages.com/site_php_files/grammar-exercise-modals.php#.UwZh_CmYYdU

http://www.agendaweb.org/verbs/modals-exercises.html

http://www.englishexercises.org/buscador/buscar.asp?nivel=any&age=0&contents=modals

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