STRUCTURE:
The present perfect continuous is formed by the subject plus the auxiliary have or has plus been plus the past participle of a verb.
SUBJECT + HAVE/HAS + BEEN + GERUND.
COMMUNICATIVE FUNCTION:
The Present perfect countinuous is used to talk about an action, passion or state that stsrted in the past ans is still taking place.
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In 1752, Benjamin Franklin made his textbook experiment with a brass key and a silk kite that he flew in a thunderstorm to prove that light...
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