Present Perfect vs Past Simple

Look at these exercises. They are very interesting.
http://www.englishpage.com/verbpage/verbs5.htm
http://www.better-english.com/grammar/pspp1.htm
http://www.1-language.com/englishcoursenew/unit55_grammar_exs.htm

Listenig activities

Some of you have asked me for more listening activities. Here you are some of them. This is a very good idea to improve this skill.
http://www.mansioningles.com/listening06.htm
http://www.mansioningles.com/listening48.htm
http://www.mansioningles.com/listening12.htm
http://www.mansioningles.com/listening38.htm

Songs are a very good way to learn English. I´m sure you know this one.
http://www.saberingles.com.ar/songs/356.html

Present Perfect or Past Simple

http://www.englishgrammarsecrets.com/presentperfectorpastsimple/exercise1.html
http://www.englishgrammarsecrets.com/presentperfectorpastsimple/exercise2.html
http://www.englishgrammarsecrets.com/presentperfectorpastsimple/exercise3.html
http://www.englishgrammarsecrets.com/presentperfectorpastsimple/exercise4.html
http://www.englishgrammarsecrets.com/presentperfectorpastsimple/exercise5.html

Past simple or Present perfect

Here you are some actiovities about these tenses.
http://perso.wanadoo.es/autoenglish/gr.perf.i.htm
http://perso.wanadoo.es/autoenglish/gr.perf.p.htm
http://perso.wanadoo.es/autoenglish/gr.presper.i.htm
http://perso.wanadoo.es/autoenglish/gr.presper.p.htm
http://perso.wanadoo.es/autoenglish/gr.since.i.htm
http://perso.wanadoo.es/autoenglish/gr.since.p.htm

What about some music?

How about singing a song? Maybe you listened to this some years ago. It could be good fun to sing it.
http://www.youtube.com/watch?v=M0ZgLjdr77U

The song " Killing me softly" has been used by Pitingo in Souleria. Here you have the original one by The Fugees. You´ll like it.
http://www.musica.com/video.asp?video=740