Question

Define perfect progressive tenses.​

Answer 1

The PRESENT PERFECT PROGRESSIVE TENSE indicates a continuous action that has been finished at some point in the past or that was initiated in the past and continues to happen.

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Answer 2

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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