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Meaning wise, what is the difference in the usage of 1. Past perfect continuous 2. Past perfect (other than it represents double past) 3. Past continuous
I feel, please correct and add to the comment
1. Past perfect continuous - represents a ’period of time’ with definite time frame 2. Past perfect (other than it represents double past) - represents a moment of time 3. Past continuous - represents period of time but with indefinite time frame, so when a year is mentioned and event is for a period of time eg. A (had been) investing in B for several years, till 2008, we will use past perfect continous due to period + definite time frame.
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1. Past perfect continuous - represents a ’period of time’ with definite time frame 2. Past perfect (other than it represents double past) - represents a moment of time
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Both past perfect and past perfect continuous indicate past of past, or, in your words, 'double past'.
Past Perfect indicates a state or a single action. Past Perfect Continuous indicates a continuing action.
This is the start of the Wikipedia article about Perfect Tenses:
Quote:
The perfect tense or aspect (abbreviated perf or prf) is a verb form that indicates that an action or circumstance occurred earlier than the time under consideration, ... https://en.m.wikipedia.org/wiki/Perfect_(grammar)
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So Present Perfect is earlier than present, and Past Perfect is earlier than Past.
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