when since and for are used in present perfect continuous
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Answer: when point of a time is there, for is used before the time. Likewise if period of time is there, since is used.
Explanation: Examples of point of time are 8 O'clock, evening, thursday, 2004 etc.
Examples of period of time are 2 hrs., 5 days, 1 week, 6 months, 12 years etc.
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