Hello everyone,
this is my first post in this forum and I hope someone can help me.
I am not a native English speaker so I hope you will forgive me all the mistakes I certainly will do...

Well, actually my question...
In my English Grammar book I used to use at school, it was said that there is a "Will-Future-Progressive-Tense" in existance in English, formed like
will have been + present participle
The only information given to this was that it is rarely used.
I'd like to know when this tense is going to be used (context), can anyone of you explain that to me please or give an example?
Thank you very much!