Future Perfect Continuous tense
It is used to express a continued or ongoing action that will start in
future and is thought to be continued till sometime in future. (Remember, an
ongoing action in future which will continue till some time in future). There
will be a time reference, such as “since 1980, for three hours” from which the
action will start in future and will continue. A sense of time reference is
found which gives an idea that action will start at some time in future and
will continue for some time. Such time
reference or sense of time reference is the identity of Future perfect
continuous tense because it tells that action will start at a particular time
in future. For example, “He will have been studying in this school since 2005”,
so the it means that he will start studying in this school in 2005 and will
study in this school till sometime in future.
Note: If there is not time reference or sense of time reference then it
is not future perfect continuous tense because there is no hint about the time
of action when it will start in future and it seems just an ongoing action in
future which resembles “future Continuous tense. So the reference of time
differentiates between Future perfect continuous tense between future
continuous tense.
Rules:
An auxiliary verb “will have been” is used in sentence. 1st form
of verb (base verb) +ing (present participle) is used as main verb in sentence.
“Since” or “for” is used before the “time reference” in sentence. If the time
reference is exactly known such as 1995, 4 O’clock then “since” is used before
the time in sentence. If the time reference is not exactly known such as three
hours, six years, four days, then “for” is used before the time in sentence.
Time reference such as 3 hours or 5 days is not exactly known because we don’t
know that about which three hours a day is told in sentence or about which 5
days in a month is told in sentence. While the 1995 is exactly know time.
Structure of sentence.
Positive Sentence.
• Subject + Auxiliary verb + main verb (Present participle) + Object +
Time reference
•Subject + will have been + (1st form of verb or base verb + ing) +
object + time reference
Examples.
I will have been waiting
for him for one hour.
She will have been
playing football since 2015.
Negative Sentence.
• Subject +”Not” inside Auxiliary verbs + main verb (present
participle) + Object + Time reference
• Subject + will not have been + (1st form of verb or base verb + ing)
+ object + Time reference
To make negative sentence, the word “not” is added inside auxiliary
verb, so it becomes “will not have been”.
Examples.
I will not have been
waiting for him for one hour.
She will not have been
playing football since 2015.
Interrogative Sentence.
• Auxiliary verb + Subject + auxiliary verb + main verb (present
participle) + object + time reference
• Will + Subject + have been + (1st form of verb or base verb+ing) +
object + time reference
Interrogative sentence starts with auxiliary verb “will” and auxiliary
verb “have been” is used after subject in sentence.
Examples.
Will I have been waiting
for him for one hour?
Will she have been
playing football since 2015?