Please enable JavaScript.
Coggle requires JavaScript to display documents.
future perfect continuous (S+will have been+V-ing+O (duration before…
future perfect continuous
S+will have been+V-ing+O
duration before something in the future
They will have been talking for over an hour by the time Thomas arrives.
cause of something in the future
Jason will be tired because he will have been jogging for over an hour.
S+am/is/are going to have been+V-ing+O
duration before something in the future
You are going to have been waiting for more than two hours when she finally arrives.
cause of something in the future
Maria's English will be perfect when she returns to Germany because she is going to have been studying Engalish in the United Kingdom for over two years.
Note
Present simple is used in the time clauses and future tenses cannot be used.
Like all future forms,the Future Perfect continuous cannot be used in clauses beginning with time expressions .
such as
when
while
before
after
by the time
if
unless
We use the Future Perfect Continuous to show that something will continue up until a particular event or time in the future.
"For five minutes,"
"for two weeks,"
and
"since Friday"
are all durations which
can be used
with the Future Perfect Continuous.
If you
do not include a duration
such as "for five minutes," "for two weeks" or "since Friday," many English speakers
choose to use the Future Continuous
rather than the Future Perfect Continuous.