What are you doing?

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

http://www.isabelperez.com/happy/tenses/present_cont.htm

http://www.eclecticenglish.com/grammar/PresentContinuous1F.html

http://www.englishpage.com/verbpage/verbs1.htm

https://sites.google.com/site/easygrammar4kids/to-be-present/present-continuous