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Link to original content: http://www.eng.fju.edu.tw/iacd_99S/grammar_composition/Tenses/new_page_7.html
Definition:
This form emphasize the
duration of one past event taking
Place before another past event. The
past perfect progressive form, like
The past progressive form, may show
a past event in progress before it
Is interrupted by another past
event.
Example:
1. The boys had been
playing baseball all the morning before their mother told them to study.
(The boys were playing baseball until
their mother told them to study.)
2. I had been doing exercise
until he came.
(I was doing exercise until he came.)
3. I felt tired because I had
been running all the way.
(I was running so I felt tired.)
4. When he arrived, I had
been waiting for him for one hour.
(I was waiting for him until he
arrived.)
Reference:
Some verbs can't put on" progressive form"; in the meanwhile, they can't
put on" past perfect progressive form" except "want" and
"wish".
Example:
1. The boy was delighted
with his new bike because he had been wanting
one for a long time.
Reference:
The sentence that has frequency can't use past perfect progressive.
Example:
1. He had been trying five
times to get her on the phone but had failed. (wrong)
Revise: He had been trying to get her
on the phone but he failed.
Future Perfect Progressive Tense
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