PRESENT PERFECT

http://www.englishclub.com/grammar/verb-tenses_present-perfect_quiz.htm
http://www.englishpage.com/verbpage/verbs5.htm
http://www.eslcafe.com/quiz/past2.html
http://www.roadtogrammar.com/ (click on Quizzes and do exercises from 248 to 254)
http://www.ego4u.com/en/cram-up/grammar/present-perfect-simple#exercises
http://www.esltower.com/GRAMMARQUIZ/intermediate/present%20perfect%20vs%20past.htm
http://www.esltower.com/GRAMMARQUIZ/intermediate/present%20perfect%20vs%20past%202.htm
http://www.englishexercises.org/makeagame/viewgame.asp?id=1394 (for/since)

Svolgi ora il seguente esercizio con PowerPoint:
presperf.ppt