Past Participles:
http://elt.oup.com/student/naturalenglish/int/e_games/nepre_games_gotoschool03?cc=ca&selLanguage=en
Been or Gone?
http://elt.oup.com/student/naturalenglish/int/a_grammar/unit01/neint_grammar01_exp?cc=ca&selLanguage=en
Present Perfect and Past Simple:
http://elt.oup.com/student/naturalenglish/int/a_grammar/unit01/neint_grammar01?cc=ca&selLanguage=en
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