present perfect and past simple for ADVANCED 1-2012 and PROFESSIONAL 1-2012

explanation:

http://ingles.wordpress.com/2007/03/06/simple-past-present-perfect/

exercises:

http://agendaweb.org/verbs/present_perfect-exercises.html

Rafael Nadal exercise and others with for/since/yet/already/etc

http://www.englishexercises.org/makeagame/viewgame.asp?id=1496

games:

http://www.eslgamesworld.com/members/games/grammar/perfectpast/spin%20wheel%20present%20past%20tenses.html

 

http://www.eslgamesworld.com/members/games/grammar/perfectpast/present%20perfect%20hangman.html