PRESENT PERFECT

http://www.ego4u.com/en/cram-up/grammar/present-perfect-simple/exercises?03
http://www.ego4u.com/en/cram-up/grammar/present-perfect-simple/exercises?04
http://www.ego4u.com/en/cram-up/grammar/present-perfect-simple/exercises?05
http://www.ego4u.com/en/cram-up/grammar/present-perfect-simple/exercises?06
http://www.ego4u.com/en/cram-up/grammar/present-perfect-simple/exercises?07
http://www.ego4u.com/en/cram-up/grammar/present-perfect-simple/exercises
http://www.better-english.com/grammar/pspp1.htm