Presente Perfecto Continuo

El presente perfecto continuo, muchas veces tiene la equivalencia de la traducción "llevar + gerundio" en español, pero el uso de esta forma es más frecuente en inglés. Se utiliza para acciones quehas empezado en el pasado pero siguen en el presente.
Subject | Auxiliary verbs | Gerund |
I, You, We, They | have been | talking, studying, waiting... |
He, She, It | has been | talking,studying, waiting... |

Affirmative Sentences (Frases afirmativas)
Estructura Sujeto + verbo auxiliar ("to have") + "been" + gerundio.
Ejemplos:
* They've been talking for three hours.
*They have [They've] been talking for three hours. (Han estado hablando durante tres horas.)
* She has been studying English since she was 16.
* She has [She's] been studying Englishsince she was 16. (Ha estado estudiando inglés desde que tenía 16 años.)
* I've been waiting for you for over an hour!
* I have [I've] been waiting for you for over an hour! (¡Te llevoesparando durante más de una hora!)
Negative Sentences (Frases negativas)
Estructura Sujeto + verbo auxiliar ("to have") + "not" + "been" + gerundio.
Ejemplos:
* They haven't been talking formore than a few minutes.
* They haven't [They've not] been talking for more than a few minutes. (No han estado hablando más de unos minutos.)
* She hasn't been studying English for verylong.
* She hasn't [She's not] been studying English for very long. (No ha estado estudiando inglés durante mucho tiempo.)
* Don't worry, I haven't been waiting long.
* Don'tworry, I haven't [I've not] been waiting long. (No te preocupes, no llevo esperando mucho tiempo.)
1. Interrogative Sentences (Frases interrogativas)
Estructura Verbo auxiliar ("to have") +sujeto + "been" + gerundio?
Ejemplos:
* Have they been talking for a long time?
* Have they been talking for a long time? (¿Han estado hablando durante mucho tiempo?)
* Has she...