Pattern:
S + HAVE/HAS + BEEN +V ING
This tense is used to show the duration of an activity which started in the past and continues to the present. It is used with time words such as for, since, all morning, all day, all week .
Examples:
Ahmad is talking on the phone. He has been talking on the phone for over a half an hour. He should hung up soon. Long distance is expensive.
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