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We use the Future Perfect Continuous to describe an ongoing or continuous action that will be in progress up to a certain point in the future.
This tense emphasizes the duration or continuity of an action that will be happening before another specific point or action in the future.
Form: will/shall have been + V+ing
For example: "She will have been studying for two hours by the time the exam starts."
This sentence indicates that the action of studying (future perfect continuous) will have been ongoing for a period of two hours leading up to the start of the exam (future simple).
Signal words: "by", "by the time", "for", "for six months", "for two hours", "by next week/month/year" etc.
The Future Perfect Simple is used to describe an action completed before another specific point or action in the future, while the Future Perfect Continuous is used to describe an ongoing or continuous action that will be happening before another specific point or action in the future.
