FUTURO SIMPLE - FUTURO PERFECTO

Future Simple:
- (oración 1) se refiere a una situación futura. Future Perfect:
- (oraciones 2 y 3) se utiliza para hacer referencia a una acción que se completará en el futuro.
It will rain tomorrow. (futuro)
It will have rained by then. (pasado desde el futuro)
A menudo se utilizan oraciones temporales que comienzan con "by..." con 'Future Perfect':
I'll have finished by this time next week.
They'll have left by the 15th.
He'll have arrived by 8 o'clock.
Para formar "Future Perfect" se utilizan los verbos auxiliares "will + have" con el participio pasado del verbo principal.
A menudo se utilizan formas contraídas:
I will have been = I'll have been
She will not have been = She won't have been