Oraciones en ingles afirmativas present perfect continuos, y las mismas cambiadas a negativas e interrogativas.
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i have been learning english for sixteen years.
how long have you been learning english
i haven't been learning english for sixteen years.
she has been travelling since march
has she been travelling for nine month?
she hasn't been travelling since march
how long have you been learning english
i haven't been learning english for sixteen years.
she has been travelling since march
has she been travelling for nine month?
she hasn't been travelling since march
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