Links to practise a bit of grammar on present perfect continuous:
http://www.englishpage.com/verbpage/presentperfectcontinuous.html
http://www.englishpage.com/verbpage/verbs8.htm
http://www.perfect-english-grammar.com/present-perfect-continuous-exercise-1.html
https://www.ego4u.com/en/cram-up/grammar/present-perfect-progressive/exercises
http://www.agendaweb.org/verbs/present_perfect_continuous-exercises.html
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