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Many journalism organizations,over the last three decades,have been working on glossaries to deal with loaded terms...last three decades is time mentioned then why is it in present perfect tense

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    They're still working. – tchrist Dec 3 '17 at 13:44
  • It's not. It's the present perfect continuous construction. – Edwin Ashworth Dec 3 '17 at 14:40
  • It is a mistaken notion that the present perfect cannot combine with any time phrase, when the reality is that it cannot combine with a time phrase that excludes the present, such as "last year, a nanosecond|millisecond|second|minute|hour|week|month|year|decade|century|millennium|eon ago, yesterday, earlier today, in 1950" and so forth. – Tᴚoɯɐuo Dec 3 '17 at 21:43
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A mention of a duration of time is acceptable with present perfect forms, with words like "for" or "over":

"They have been working there for/over the last three decades."

The rule that we should not mention time with present perfect forms applies to time-related words and phrases that indicate when the event started/occurred. The exception is when you use the word "since".

"They have been working there in 1982." - Wrong

"They have been working there since 1982." - Correct

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