Question

show the sentence structure of
past perfect continuous tense​

Answer 1

Answer:

Subject+had+been+verb(ing)+from/for+object.

Explanation:

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Answer 2

Past Perfect Continuous Tense represents an ongoing action that started and continued for some time in the past. To indicate time reference “for” and “since” are used and it describes when the action started and how long it continued in the past.
Examples of Past Perfect Continuous Tense
I had been writing articles on various topics for three hours.

He had been reading different kinds of books since morning.

They had been playing football in that field before it started to rain.

Jane had been gossiping in the coffee shop for two hours.

Jeff had been studying in the library before he came to the class.

We had been shopping in that shop before we came home.

We had been watching a movie in this Cineplex for three hours.