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Употребление Future Perfect — справка

Когда используется	Примеры
Действие будет уже завершено к определённому моменту в будущем.	Melody's working day ends at six o'clock. At six-fifteen, she will have gone home. — Will Mary be at the party by midnight? — No, she will have left by that time. — Will you be having lunch at 2 pm? — No, we'll have finished by that time. It will be raining in the afternoon, but it'll have stopped raining by five o'clock.
С глаголами состояния (be, know, live etc.): показать, что к определённому моменту в будущем действие уже будет длиться какое-то время.	On the second of March, we'll have been married for one year. On Friday, she'll have lived here for one month.

Когда используется

Примеры

Действие будет уже завершено к определённому моменту в будущем.

Melody's working day ends at six o'clock. At six-fifteen, she will have gone home.

— Will Mary be at the party by midnight? — No, she will have left by that time.

— Will you be having lunch at 2 pm? — No, we'll have finished by that time.

It will be raining in the afternoon, but it'll have stopped raining by five o'clock.

С глаголами состояния (be, know, live etc.):
показать, что к определённому моменту в будущем действие уже будет длиться какое-то время.

On the second of March, we'll have been married for one year.

On Friday, she'll have lived here for one month.