WEEK 13 PEACE AND HARMONY IN OUR GALAXY

Present Perfect Simple -past action with a present result

SOURCE:http://www.google.ro/url?sa=i&rct=j&q=&esrc=s&source=images&cd=&cad=rja&docid=w6GpPr9QMF3kkM&tbnid=Zo7flSvQN-6kJM:&ved=0CAUQjRw&url=http%3A%2F%2Fwww.5percangol.hu%2Fcikk%2F436&ei=AP-ZUsTpCZDDswbFsoDwCA&bvm=bv.57155469,d.Yms&psig=AFQjCNFZiDTkVgxpLHSVafM_UURiP9gyMA&ust=1385910313902296

STUDY
http://www.grammar.cl/Present/Perfect_Tense.htm

PRACTICE
http://s.mound.free.fr/skyblues67/presentperfect/presperfect1.htm
http://www.nspeak.com/newbasic/grammatica/presperfect.htm
http://www.englisch-hilfen.de/en/complex_tests/present_perfect1/index.php?action=start2&aufgid=12&Submit=Answer+a+special+part
http://www.english-grammar-lessons.com/presentperfect/exercise2.swf
http://www.ego4u.com/en/cram-up/grammar/present-perfect-simple/exercises
http://www.learnenglish.de/Games/Tenses/PresPerSim.html

Present Perfect with 'already ' and ' yet '
http://www.eclecticenglish.com/grammar/PresentPerfect1C.html