class 8: be allowed to

be allowed to:
http://www.kico4u.de/english/uebungen/hilfsverben/ableallow.htm
http://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-63918.php

mixed exercises: can, be able to, be allowed to

Watch the video, then do the exercises
http://www.sofatutor.com/englisch/videos/to-be-able-to-to-be-allowed-to-uebungsvideo

http://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-72116.php
http://www.englisch-hilfen.de/en/exercises/modals/can.htm
http://www.tinyteflteacher.co.uk/learning-english/grammar/exercises/modal-verbs-ability.html
http://autoenglish.org/gr.can.i.htm