El esquema del past perfect continous es: Sujeto (I,you,he,she,it,we,you,they) + had + been + verbo que acaba en -ing. Por ejemplo: I had been waiting, They had been thinking, She had been playing... Y esto se traduce como "yo había estado pensando..", "había estado haciendo unos ejercicios..."., "habia estado trabajando.."

El esquema del past perfect continous es: Sujeto (I,you,he,she,it,we,you,they) + had + been + verbo que acaba en -ing. Por ejemplo: I had been waiting, They had been thinking, She had been playing... Y esto se traduce como "yo había estado pensando..", "había estado haciendo unos ejercicios..."., "habia estado trabajando.."