U 2 Grammar 2.6
Present perfect simple and continuous
https://test-english.com/grammar-points/b1/present-perfect-simple-present-perfect-continuous/
https://test-english.com/grammar-points/b1-b2/present-perfect-simple-continuous/
https://elt.oup.com/student/solutions/upperint/grammar/grammar_01_012e?cc=ee&selLanguage=en
https://www.eltbase.com/quiz/151_01.htm
https://www.ego4u.com/en/cram-up/grammar/prepersim-preperpro/exercises
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