1.Check the form here:
http://www.isabelperez.com/happy/tenses/form/perfectform.htm
2.Check the use here:
http://www.isabelperez.com/happy/tenses/use/perfectuse.htm
3.Now do these exercises:
http://web2.uvcs.uvic.ca/elc/studyzone/330/grammar/prperf1.htm
http://www.isabelperez.com/happy/tenses/exercises/present_perfect_1.htm
http://www.isabelperez.com/happy/tenses/exercises/present_perfect_2.htm
http://www.isabelperez.com/happy/tenses/exercises/present_perfect_mistakes.htm
http://www.isabelperez.com/happy/tenses/exercises/pres_perf_1.htm
4.Listen and do the activities on line:
http://www.mansioningles.com/nc_lec18_1.htm
5.What has just happened in these pictures? (Oral pairwork)
2.The girl.......................................................................................
You have already finished the exercise...