Past Tense

d. Present Perfect Continuous

         1. Affirmative : subject + has/ have + been + v (ing) + since/ for

              Example :

              - I have been running since 5 O’clock.

          2. Negative : subject + has/ have + not + been + v (ing) + since/ for

              Example :

              - He has not been playing since an hour ago.

          3. Interrogative : has/ have + sub + been + v (ing) + since/ for

               Example :

               - Has he been working for a week?

           4. Interrogative dan Negative : has/ have + subject +  not + been + v (ing) + since/ for
               Example :
               - Have you not been sleeping for 8 hours?
           Note : 

                  Since : for example, since yesterday, since last year, since 10 o'clock yesterday, since this                        
                  For: period of time, eg 2 days, a week, 10 minutes, one hour.

                  'Since' and 'for' is also used in the perfect tense.Example :

               - Have you not been sleeping for 8 hours?