Question

past perfect continuous interrogative structure​

Answer 1

Answer:

For yes/no questions :-

Had / subject / been / ing verb / object?

For wh type questions,

Wh - verb / had / subject / been / ing verb / object?

Answer 2

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Had + Subject + been + Verb (Ist form) + Ing + Object + For/Since + Time

$\tt \pink{hope \: my \: answer \: helps!}$