There is no elevator to success. You have to take the stairs.....
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www.englisch-hilfen.de/en/exercises/tenses/simple_past_present_perfect.htm
www.englisch-hilfen.de/en/exercises/tenses/simple_past_present_perfect2.htm
www.englisch-hilfen.de/en/exercises/tenses/simple_past_present_perfect3.htm
www.englisch-hilfen.de/en/exercises/tenses/simple_past_present_perfect4.htm
www.agendaweb.org/verbs/present-perfect.html
www.agendaweb.org/verbs/present-perfect-simple-past-simple-exercises.html
www.agendaweb.org/verbs/present-perfect-past-simple.html
www.adelescorner.org/grammar/past_perfect/past_perfect_vs_past_simple.html
