Future Perfect Continuous
The future perfect continuous is formed by will + have + been + -ing form
I will have been playing You will have been playing He /she will have been playing
We will have been playing They will have been playing
Future Perfect Continuous use
Before you learn about the use of the future perfect continuous, beware that there are some verbs which cannot be used in any of the continuous tenses. Some verbs will sound strange to you in the continuous form, and it is a good idea to learn what these verbs are: Verbs that Cannot be Used in the Continuous Tenses
The future perfect continuous is used to talk about continuing or repeating events that will have been in progress up to a certain time in the future.
The explanation for this tense seems a little complicated, and the tense is not used very often, but it does have its uses.
If you want to say that by a certain point in the future you will have been doing something for a long time, then this is the tense you should use.
The sentences below talk about the duration of an activity before a certain time in the future:
‘I will have been studying French for 5 years at the end of this year’
‘‘By the time I am 50 I will have been studying at the school for more than 20 years!’
‘We should stop at the next junction because we will have been driving for 5 hours’
For a clearer explanation about when to use the future perfect and future perfect continuous click on the link below: