Mbak Ustadzah

PAST PERFECT CONTINUOUS TENSE

    Menekankan lamanya sebuah aktivitas yang sedang terjadi selama beberapa waktu sebelum aktivitas lain terjadi di masa lampau

FORMULA
(+) S + had + been + V-ing + O
(-)  S + had + not + been + V-ing + O
(?) Had + S + been + V-ing + O

TIME SIGNAL
1. For + period of time + before + S.past
2. For + period of time + when + S.past

EXAMPLE 
1. (+) We had been listening to music for an hour when it started to rain
2. (-)  She hadn't been cutting a beautiful flower for 50 minutes in the garden yesterday
3. (?) Had Ana been doing her homework for 10 minutes before the teacher came in ?