Use it to show how long an action will have been in progress by a future time.
The future perfect continuous measures how long an activity will have been going on when a future moment arrives. By May I will have been working here for five years counts the duration up to that point. It is formed with will have been plus the -ing form.
It is the least frequent of the twelve tenses, and it is almost always paired with an explicit period of time. Recognising it matters more than producing it: you will meet it in formal writing and in exam reading far more often than you will need it in conversation.
How to form the Future Perfect Continuous
Form
Structure
Affirmative
Subject + will have been + V-ing
Negative
will not have been + V-ing
Question
Will + Subject + have been + V-ing?
Future Perfect Continuous example sentences
AffirmativeBy July I will have been studying for 2 years.
NegativeHe won't have been sleeping for long.
QuestionWill you have been driving 5 hours by then?
5 short stories in the Future Perfect Continuous
Reading the tense in context is what makes it stick. Every future perfect continuous verb below is highlighted, so you can see the pattern repeating across 605 words of natural English.
Highlighted: future perfect continuous verb
The Devoted Employee's Jubilee
By the time the clock strikes midnight on December 31st, Mr. Harrison will have been working at the national bank for exactly forty years. When he attends his official retirement party next week, his colleagues will celebrate his incredible loyalty.
By that date, he will have been managing the main financial accounts since the early days of the company. He won't have been taking long vacations or extended leaves; instead, he will have been dedicating his entire adult life to the growth of the firm.
The board of directors knows that for four decades, Mr. Harrison will have been arriving at the office before everyone else. When he finally closes his office door, he will know that his hard work will have been shaping the careers of hundreds of young bankers.
The Non-Stop Flight to Sydney
By the time Captain Rogers finally lands the massive commercial airplane in Sydney tomorrow morning, the passengers will be incredibly exhausted. By the moment the wheels touch the runway, the aircraft will have been flying through the sky for seventeen hours without a single stop.
The experienced flight attendants will have been serving hot meals, fresh coffee, and cold drinks to over three hundred passengers throughout the night. Because of the long distance, the onboard computer systems will have been tracking the precise weather patterns across the Pacific Ocean for hours.
The travellers won't have been walking around much due to the tight space, but they will rejoice knowing that this non-stop route will have been saving them nearly a whole day of travel time.
The Master Artisan
By next summer, the world-renowned sculptor, Giovanni, will showcase his ultimate masterpiece in the grand gallery of Rome. By the time the exhibition opens to the public, he will have been carving that single block of white marble for more than three years.
Visitors will admire the intricate details, unaware that Giovanni will have been standing in his dusty studio for ten hours a day, shaping the stone with his small chisel. He won't have been painting or working on other smaller projects during this time because he wanted total focus.
His young apprentices have been observing his flawless technique, knowing that his creative passion will have been inspiring the next generation of Italian artists for decades to come.
The Climate Research Expedition
By the end of this month, the brave international team of scientists in Antarctica will complete their winter research cycle. By next Tuesday, they will have been living in isolated freezing modules under extreme sub-zero temperatures for six months straight.
The researchers will have been collecting deep ice core samples every morning to study prehistoric climate patterns. Because of the severe blizzards, they won't have been exploring the open landscape as much as they planned.
However, their advanced automated sensors will have been recording valuable global atmospheric data without a single interruption. When the rescue ship arrives, the team will know that their cold survival will have been providing crucial answers to save the planet.
The Gamer's Marathon
By 8:00 PM tonight, Toby's charity live-stream will finally reach its conclusion. By that exact moment, Toby will have been playing the latest strategy game for twenty-four consecutive hours to raise money for a children's hospital.
Millions of viewers worldwide will have been watching his chaotic screen and interacting with him through the live chat. He won't have been sleeping at all, surviving only on energy drinks and healthy snacks.
His supportive online community will have been donating thousands of dollars every hour of the marathon. When he finally turns off his computer webcam, Toby will smile through his heavy sleepiness, proud that his favourite hobby will have been helping real families in deep need.
The future perfect marks completion — By Friday I'll have written the report means it will be finished. The future perfect continuous measures duration reaching that point — By Friday I'll have been writing it for a month. The continuous form nearly always carries an explicit length of time.
Is this tense actually used?
Yes, though sparingly. It appears most in anniversaries, service records and project timelines, where the length of an ongoing activity matters: Next month she will have been leading the team for two years. In everyday conversation speakers often rephrase it more simply.
Can it be used with state verbs?
No, consistent with every other continuous form. Will have been knowing is wrong; use the future perfect simple instead — By June I will have known her for a decade. State verbs reject the continuous in all twelve tenses.
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