El Future Perfect Continuous (Futuro Perfecto Continuo) en inglés tiene dos formas diferentes: will have been doing y be going to have been doing.
A diferencia de las formas del Future Simple, las del Future Perfect Continuous generalmente son intercambiables.
Future Perfect Continuous con Will
Will have been + present participle
Ejemplos:
- You will have been waiting for more than two hours when her plane finally arrives.
- Will you have been waiting for more than two hours when her plane finally arrives?
- You will not have been waiting for more than two hours when her plane finally arrives.
Future Perfect Continuous con Be Going To
Am / is / are + going to have been + present participle
Ejemplos:
- You are going to have been waiting for more than two hours when her plane finally arrives.
- Are you going to have been waiting for more than two hours when her plane finally arrives?
- You are not going to have been waiting for more than two hours when her plane finally arrives.
Uso
Acción continua en el futuro que ocurre antes que otra
El Future Perfect Continuous en inglés se utiliza para expresar una acción que continuará hasta un momento específico en el futuro. For five minutes, for two weeks y since Friday son acciones continuas en el futuro que pueden utilizarse en Future Perfect Continuous. La diferencia del Future Perfect Continuous con el Present y Past Perfect es que la acción dada se completa antes o en el momento futuro especificado.
Ej.:
- They will have been talking for over an hour by the time Thomas arrives.
- She is going to have been working at that company for three years when it finally closes.
- James will have been teaching at the university for more than a year by the time he leaves for Asia.
- How long will you have been studying when you graduate?
- We are going to have been driving for over three days straight when we get to Anchorage.
- A: When you finish your English course, will you have been living in New Zealand for over a year?
B: No, I will not have been living here that long.
Es importante prestar atención a que el momento futuro hasta el cual ocurre la acción (marcado en cursiva en los ejemplos anteriores) está en Simple Present, no en Simple Future.
Razón para algo en el futuro
El uso del Future Perfect Continuous antes de otra acción en el futuro es una buena manera de expresar causa y efecto en inglés.
Ej.:
- Jason will be tired when he gets home because he will have been jogging for over an hour.
- Claudia's English will be perfect when she returns to Germany because she is going to have been studying English in the United States for over two years.
Future Continuous o Future Perfect Continuous
El Future Continuous enfatiza acciones interrumpidas, mientras que el Future Perfect Continuous enfatiza la duración de una acción futura que ocurre antes que otra.
Ej.:
- He will be tired because he will be exercising so hard.
Esta oración enfatiza que estará cansado porque estará haciendo ejercicio en un momento futuro específico
- He will be tired because he will have been exercising so hard.
La oración enfatiza que estará cansado porque habrá estado entrenando durante un período de tiempo específico
El Future Perfect Continuous no puede utilizarse con oraciones que comienzan con expresiones de tiempo como: when, while, before, after, by the time, as soon as, if, unless, etc. En su lugar se utiliza el Present Perfect Continuous.
Ej.:
- You won't get a promotion until you will have been working here as long as Tim. No correcto
- You won't get a promotion until you have been working here as long as Tim. Correcto
Adverbios
- You will only have been waiting for a few minutes when her plane arrives.
- Will you only have been waiting for a few minutes when her plane arrives?
- You are only going to have been waiting for a few minutes when her plane arrives.
- Are you only going to have been waiting for a few minutes when her plane arrives?
Voz activa y pasiva
- The famous artist will have been painting the mural for over six months by the time it is finished.
- The mural will have been being painted by the famous artist for over six months by the time it is finished.
- The famous artist is going to have been painting the mural for over six months by the time it is finished.
- The mural is going to have been being painted by the famous artist for over six months by the time it is finished.
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