Question

they have been playing here since morning (change'past perfect continuous tense)​

Answer 1

Answer:

They had been playing here since morning.

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Answer 2

Present perfect continuous tense - They have been playing here since morning.

Past perfect continuous tense - They had been playing here since morning.

1. Past perfect continuous tells us about an action that was continuing at some time in past and then got completed.
2. The construction of sentences in past perfect continuous tense is as follows:

• had been+ present participle of the verb.