Listen and thenn read the following situation:
MORE EXPLANATION:
https://www.lawebdelingles.com/destacados/present-perfect-simple-o-present-perfect-continuous/
https://learnenglish.britishcouncil.org/intermediate-grammar/present-perfect-simple-and-present-perfect-continuous
2.-Reading and vocabulary exercise.http://www.blairenglish.com/exercises/technology_web/exercises/computer_problems/computer_problems.html
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