FIRST SENIORS INTERACTIVE EXERCISES (PAST/PRESENT PERFECT)

http://www.5minuteenglish.com/may5.htm

http://www.5minuteenglish.com/mar31.htm

http://www.5minuteenglish.com/jul28.htm

http://www.5minuteenglish.com/jan21.htm

http://www.ompersonal.com.ar/omexercise/tiemposverbales/unit11.htm

http://www.angelfire.com/wi3/englishcorner/grammar/rules/presperfvssimppas.html (information about both tenses)

http://www.ompersonal.com.ar/omexercise/tiemposverbales/unit13.htm

http://www.ompersonal.com.ar/omexercise/tiemposverbales/unit14.htm

http://www.angelfire.com/wi3/englishcorner/grammar/Interactive/spvprpf1.html

http://www.smic.be/smic5022/testtenses2.htm

http://www.quia.com/pop/153349.html