Simple Future Perfect Continuous Tense

The future perfect continuous, also sometimes called the future perfect progressive, is a verb tense that describes actions that will continue up until a point in the future. The future perfect continuous consists of will + have + been + the verb’s present participle (verb root + -ing).

When we describe an action in the future perfect continuous tense we are projecting ourselves forward in time and looking back at the duration of that activity. The activity will have begun sometime in the past, present, or in the future, and is expected to continue in the future.

Examples:

· In November, I will have been working at my company for three years.

· At five o’clock, I will have been waiting for thirty minutes.

· When I turn thirty, I will have been playing piano for twenty-one years.

The future perfect continuous is composed of two elements
the future perfect of the verb "to be" (will have been) + the present participle of the main verb (base + ing)

Like the future perfect simple, this form is used to project ourselves forward in time and to look back. It refers to events or actions that are currently unfinished but will be finished at some future time. It is most often used with a time expression.

Examples

· I will have been waiting here for three hours by six o'clock.

· By 2001 I will have been living in London for sixteen years.

· When I finish this course, I will have been learning English for twenty years.

· Next year I will have been working here for four years.

· When I come at 6:00, will you have been practicing long?