present simple/present continuous

http://www.youtube.com/watch?v=yWccPqg1DbI&feature=related
http://www.youtube.com/watch?v=2McNvst-g4o&feature=related
http://www.youtube.com/watch?v=5RYdMEDfRdU&feature=related

simple past

http://www.youtube.com/watch?v=Bvou2XxB5Cs
http://www.wiziq.com/tutorial/11864-Past-Simple-Tense
http://maguga59.blogspot.com/2009/12/activities-related-to-past-simple-tense.html
http://www.agendaweb.org/
http://www.youtube.com/watch?v=J5E9SWg6_fw
http://www.youtube.com/watch?v=Qp70cSK9hxo
http://www.youtube.com/watch?v=gK12tjcqpsM&feature=related
http://www.youtube.com/watch?v=ufk7Da__lPA&feature=related