TUTORIAL (vídeo):
PRESENT PERFECT SIMPLE: http://www.youtube.com/watch?v=PaTx5Mx2F4Y
ACTIVITIES:
https://www.ego4u.com/en/cram-up/grammar/present-perfect-simple/exercises
http://www.englishpage.com/verbpage/verbs5.htm
(for/since; just; ever; yet/already): http://www.uhu.es/antonia.dominguez/presentperfect.pdf
PAST SIMPLE vs PRESENT PERFECT:
http://www.perfect-english-grammar.com/support-files/present_perfect_or_past_simple_2.pdf
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