Present continuous

Present Continuous
http://www.isabelperez.com/happy/tenses/exercises/present_cont_1.htm

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

http://www.ego4u.com/en/cram-up/grammar/present-progressive/form/exercises?form03

http://www.ego4u.com/en/cram-up/grammar/present-progressive/form/exercises?form04

Present simple and Present Continuous
http://www.ego4u.com/en/cram-up/grammar/simpre-prepro/exercises

http://www.ego4u.com/en/cram-up/grammar/simpre-prepro/exercises?ex02

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

http://www.englisch-hilfen.de/en/exercises/tenses/simple_present_progressive2.htm