Perfect Continuous Tenses

употребляются, когда уже начавшееся действие продолжается в указанный момент в настоящем, прошлом или будущем.

have + been + глагол -ing

Признаки	Present Perfect Continuous
have has	+ been + гл. –ing	They have been replacing the equipment for 3 days. (заменяют оборудование уже) Have they been replacing the equipment for 3 days? Yes, they have. No, they have not.

Признаки	Past Perfect Continuous
had	+ been +глагол –ing	They had been replacing the equipment for 3 days, when a new instruction arrived (заменяли уже). Had they been replacing the equipment for 3 days, when a new instruction arrived? Yes, they had. No, they had not. They had not been replacing the equipment for 3 days, when a new instruction arrived (не заменяли еще и 3-х дней).
Признаки	Future Perfect Continuous
shall have will have	+been +глагол –ing	The will have been replacing the equipment for 3 days on Friday (уже будут заменять 3 дня). Will they have been replacing the equipment for 3 days on Friday? Yes, they will. No, they will not. The will not have been replacing the equipment for 3 days on Friday.

Неличные формы глагола.

Инфинитив. The infinitive. Признак: to.

Неопределенная форма глагола

Формы инфинитива

	Active V	Passive V
Indefinite/Simple Continuous Perfect	to replace to be replacing to have replaced	To be replaced - to have been replaced

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