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PAST PERFECT CONTINUOUS
Reescribe las oraciones en pasado perfecto continuo según la forma solicitada, siguiendo las reglas gramaticales:
I had been cooking for you. (negative)
You had not been reading since this morning. (affirmative)
She had been living here. (interrogative)
Had we been studying Maths? (negative)
She had not been reading my book. (affirmative)