PRESENT PERFECT

http://www.englisch-hilfen.de/en/exercises/tenses/simple_past_present_perfect.htm
http://www.ego4u.com/en/cram-up/grammar/present-perfect-simple/exercises?07
http://www.better-english.com/grammar/pspp1.htm

RELATIVE PRONOUM

http://wwwedu.ge.ch/cptic/prospective/projets/anglais/exercises/relpron2.htm
http://wwwedu.ge.ch/cptic/prospective/projets/anglais/exercises/whowhich.htm
http://wwwedu.ge.ch/cptic/prospective/projets/anglais/exercises/papereater.htm
http://www.vemconcursos.com/opiniao/index.phtml?page_id=21

RELATIVE PRONOUN

http://www.englisch-hilfen.de/en/exercises/pronouns/relative_pronouns2.htm
http://www.englisch-hilfen.de/en/exercises/pronouns/relative_pronouns.htm
http://www.eflnet.com/grammar/relpronoun.php