PAST CONTINUOUS AND PAST SIMPLE + WHEN/WHILE

http://www.englishexercises.org/makeagame/viewgame.asp?id=6631

http://www.english-online.org.uk/beginners8/beg8gram4n.htm

http://www.englishexercises.org/makeagame/viewgame.asp?id=734

http://www.englishexercises.org/makeagame/viewgame.asp?id=2140

http://www.englishexercises.org/makeagame/viewgame.asp?id=4299

http://www.englishexercises.org/makeagame/viewgame.asp?id=1206