The Present Perfect is used to refer to actions that started in the past and continued until now (they may continue in the future). These actions are usually followed by time expressions such as "since", "for", "yet", "already", "just"," "never"...
Formation: Auxiliary Verb 'Have'/' has' + Past participle of the main verb
e.g.: I have never seen "Garfield".
Exercises just on the Present Perfect Tense
http://www.englishpage.com/verbpage/presentperfect.html
http://www.ego4u.com/en/cram-up/grammar/present-perfect-simple
http://www.ego4u.com/en/cram-up/grammar/present-perfect-simple/exercises?07
Present Perfect with For and Since:
http://www.englishclub.com/grammar/verb-tenses_present-perfect_fs.htm
http://www.oup.com/elt/global/products/englishfile/preint/a_grammar/file07/grammar07_a01/
http://www.englishpage.com/verbpage/presentperfect.html
http://www.ego4u.com/en/cram-up/grammar/present-perfect-simple
http://www.ego4u.com/en/cram-up/grammar/present-perfect-simple/exercises?07
Present Perfect with For and Since:
http://www.englishclub.com/grammar/verb-tenses_present-perfect_fs.htm
http://www.oup.com/elt/global/products/englishfile/preint/a_grammar/file07/grammar07_a01/
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