Question

past perfect continuous definition
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Answer 1

Answer:

The past perfect continuous tense (also known as the past perfect progressive tense) shows that an action that started in the past continued up until another time in the past. The past perfect continuous tense is constructed using had been + the verb's present participle (root + -ing).

I hope it's help you to understand:))

Answer 2

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☞ The past perfect continuous tense shows that an action that started in the past continued up until another time in the past.