Теорія:

Study some information about negative sentences in Past Perfect Continuous.
 
Для утворення Past Perfect Continuous вживаємо конструкцію had been і основне дієслово із закінченням -ing.
Subject \(+\) had \(+\) been \(+\) Ving \(+\) other parts of the sentence.
У заперечних реченнях дотримуйтесь наступного порядку слів:
subject \(+\) had \(+\) not \(+\) been \(+\) Ving \(+\) other parts of the sentence.
Examples:
 
Mary had not (hadn't) been learning Maths all day. She was free.
  
              I                  
                                                               had not (hadn't) been studying
 
       
            you
 
had not (hadn't) been studying
 
he, she, it
 
had not (hadn't) been studying
 
we
 
had not (hadn't) been studying
 
You
 
had not (hadn't) been studying
 
They
 
had not (hadn't) been studying