Simple Past vs. Present Perfect

Marce, Caro and Adri.
These are sites where you can find activities on this topic.

You may do them on line. It will take just 2 minutes.

http://www.go4english.com/vg/read.php?unitid=1853
http://www.go4english.com/vg/read.php?unitid=1853&pageid=3403