Practice on Present Perfect

Hi People!

I've found this web page on You Tube. It may help with the Present Perfect:
http://www.youtube.com/watch?v=l2fPHzkBMok

After watching the video, go to this web page for further explanation on Present Perfect:
http://www.learnamericanenglishonline.com/Yellow%20Level/Y3-%20The%20Present%20Perfect.html

Finally, here you have on line exercises.
http://www.learnamericanenglishonline.com/Exercises/Present%20Perfect%20Exercise%201.html

Hope you enjoy it!
Let me know how you got on with Present perfect and the exercises.
(Haganme algun comentario sobre como les fue con estas paginas y los ejercicios)

Liliana.