Year 2: Present Simple or Continuous?

Some websites where you can find useful explanations and practise:

http://www.isabelperez.com/happy/tenses/exercises/present_6.htm
http://web2.uvcs.uvic.ca/elc/studyzone/330/grammar/simcon.htm
http://www.mansioningles.com/gram39.htm
http://esl.about.com/library/beginner/bl_bgpresorcont.htm