Теория:

Study some information about positive sentences in Future Perfect Continuous.
 
Для образования Future Perfect Continuous необходимо использовать структуру will have been и основной глагол с окончанием -ing.
Subject \(+\) will \(+\) have \(+\) been \(+\) Ving \(+\) other parts of the sentence.
Для построения утвердительного предложения нужно использовать следующий порядок слов:
subject \(+\) will \(+\) have \(+\) been \(+\) Ving \(+\) other parts of the sentence.
Examples
 
Mark will have driving a сar for two hours tomorrow.
  
Jane will have been working for three hours tomorrow.
 
              I                  
                                                               will have been working
 
       
            you
 
will have been working
 
he, she, it
 
will have been working
 
we
 
will have been working
 
You
 
will have been working
 
They
 
will have been working