https://www.englishrevealed.co.uk/PET/grammar/present_perfect_past_simple_1.php
https://www.englishrevealed.co.uk/PET/grammar/present_perfect_past_simple_2.php
WORK ON THE PAGE 3. https://es.slideshare.net/JuanGuillermoSepulve2/workbook-6
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