Used to / be used to / get used to / would do sthg.

Quiz - used to do / be used to
http://www.englishclub.com/grammar/verbs-m_used_quiz.htm


Explanations
http://www.englishpage.com/verbpage/usedto.html
http://www.englishpage.com/verbpage/would.html


Explanation and 4 nice interactive tasks
http://www.englishgrammarsecrets.com/usedto/menu.php

Lots of activities to practice using the grammar
http://www.agendaweb.org/verbs/to-be-used-to.html