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The
Perfect Progressive Tenses
Present
Perfect Progressive:
The action
in this tense began in the past, continued for some time, and has ended
by the present.
The
kitchen tap has
been dripping.
The
Past Perfect Progressive:
The past perfect
progressive presents an ongoing condition in the past
that ended by the time the sentence started.
The kitchen
tap had been dripping.
Future
Perfect Progressive:
This tense indicates
that an action will begin in the future and
will be continuing until some time in the future.
The kitchen
tap will have been dripping.
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