Concerning the Future Perfect Continuous,
analyze the following items.
I. We use will/shall + have + been + the -ing form of
the verb.
II. We use shall only for future time reference with I
and we.
III. Shall is more informal and less common than will.
IV. We use the future perfect continuous form when
we are looking back to the past from a point in the
future and we want to emphasise the length or
duration of na activity or event.
Choose the correct answer: