Hacer 3 oraciones de presente perfecto progresivo una positiva otra pregunta y otra en negativa ,
Subj+have o has+been +verb ing+complemento
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I have been waiting for you since yesterday.
She has not been working here since last year.
Have they been studying for 2 hours?
She has not been working here since last year.
Have they been studying for 2 hours?
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