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

past simple / past continuous

 Hello,

Here you have a number of online exercises to practise the 2 tenses before the short test.

http://www.englishgrammarsecrets.com/pastsimpleorcontinuous/exercise1.html
http://www.englishgrammarsecrets.com/pastsimpleorcontinuous/exercise2.html
http://www.englishgrammarsecrets.com/pastsimpleorcontinuous/exercise3.html
http://www.englishgrammarsecrets.com/pastsimpleorcontinuous/exercise5.html

http://www.perfect-english-grammar.com/past-simple-past-continuous-exercise-1.html

http://www.englishexercises.org/makeagame/viewgame.asp?id=734
http://www.ego4u.com/en/cram-up/grammar/simpas-paspro/exercises?ex07
http://www.ego4u.com/en/cram-up/grammar/simpas-paspro/exercises?ex08
http://www.englisch-hilfen.de/en/exercises/tenses/simple_past_progressive.htm
 http://www.englishpage.com/verbpage/verbs3.htm