While and when exe 3eros

http://www.englishexercises.org/makeagame/viewgame.asp?id=3397

http://www.englishexercises.org/makeagame/viewgame.asp?id=3397


http://www.englishtenses.com/test/when_or_while_test


http://www.englishtenses.com/test/when_or_while_test


http://www.englisch-hilfen.de/en/exercises/tenses/simple_past_progressive.htm