Question

Rumus (+) , (-) dan (?) past perfect continous tense

Answer 1

(+) S + had + been + V1-ing/present participle
(-) S + had + not + been + V1-ing/present participle
(?) had + S + been + V1-ing/present participle

Answer 2

(+) subject + had+ been+verb-ing+object
(-) subject + had+ not + been + verb-ing+ object
(?) had+ subject + been + object