SEE REPORT Present Perfect Continuous

Use: actions started in the past and continue now. Usually, the length of time or a time reference is used: since..., for....

Form: has/have been VERBing
Examples:
They
have been making the same mistakes for years.
Ever since her father died, she
has been working on a cure.

David
is writing an article for this month's journal. (present continuous)


Negative Form: has/have not been VERBing
Example:
They
have not been following FDA guidelines for a very long time.

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