We are about to start unit 7 which is about the Past Simple and the Present Perfect. Watch the following videos:

PAST SIMPLE

 [kml_flashembed movie=" http://www.youtube.com/v/mW7Xd9xBWvY " width="425" height="350" wmode="transparent" /]

PRESENT PERFECT

[kml_flashembed movie="http://www.youtube.com/v/OwEW0cTgMew" width="425" height="350" wmode="transparent" /]

PAST SIMPLE AND PRESENT PERFECT 

[kml_flashembed movie="http://www.youtube.com/v/-hK7nEZrA2k" width="425" height="350" wmode="transparent" /]