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Present Perfect Vs Past Simple
Here are some online activities for practice, if you feel you could use some!
https://www.englisch-hilfen.de/en/exercises/tenses/simple_past_present_perfect4.htm
https://www.englisch-hilfen.de/en/grammar/present_perfect_simple_past_contrasted.htm (theory contrasted.. it's useful!)
http://www.adelescorner.org/grammar/pres_perfect/pres_per_vs_past_simple.html
http://www.focus.olsztyn.pl/en-exercises-on-present-perfect-tense.html#.X9XfOHrivDc