used to / would

 http://www.englishgrammarsecrets.com/usedto/exercise1.swf

http://www.englishexercises.org/makeagame/viewgame.asp?id=2447

http://www.esl-lounge.com/student/grammar/3g11-used-to-would.php

 http://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-26509.php

http://www.englishgrammarsecrets.com/usedto/exercise3.swf
http://www.englishgrammarsecrets.com/usedto/exercise4.swf
http://www.englishexercises.org/makeagame/viewgame.asp?id=2448

subject / object questions

http://www.esl-lounge.com/student/grammar/3g26-subject-object-questions.php

http://www.english-zone.com/grammar/questions4.html

https://learnenglish.britishcouncil.org/en/grammar-exercises/question-forms-subjectobject-questions

http://esl.about.com/library/quiz/blgrquiz_questionforms_subob.htm