Теория:

Study some information about the Present Perfect Continuous.
 
Present Perfect Continuous указывает на действие, которое началось в прошлом, продолжалось в течение некоторого времени и либо закончилось непосредственно перед разговором или все еще продолжается в момент разговора.

Например,
  
I have been waiting in the office for 2 hours!
  
We have been preparing for the test since morning.

Образование Present Perfect Continuous
 
have/has been + Ving
 
has используется только для 3 лица единственного числа
 
Утвердительные предложения:
 
 
I have been working 

You have been working 

He / she / it has been working 

We have been working

They have been working

Вопросительные предложения:
  
Have I been working

Have you been working

Has he / she / it been working

Have we been working?

Have they been working?

Отрицательные предложения:
  
I have not been working 

We have not been working 

You have not been working 

You have not been working 

He / she / it has not been working 

They have not been working