The future perfect continuous tense is used to emphasise the duration of an action.
e.g. “In 2020, we will have been running for 70 years.” (In this article, “we” is The Royal Edinburgh Military Tattoo.)
Another common use of this tense, which does not appear to be mentioned in the textbooks, is to speculate about something that happened in the past
e.g. “Cottam started operating in 1969 and is capable of powering around 3.7m homes, though in recent years it will have been operating well below its maximum capacity.”
e.g. “This rope will have been slowly breaking down in the sun and shedding tiny bits of micro fibre into the sea for animals to ingest.”
Photo credit: James Stringer
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