It is used to tell about things which continue to happen over a long period of time in history.
Example
- Trains had been running late since the last one month
- She had been taking precautions since last week
- In this case,we use " had been " + verb+ing with the verbs(both singular and plural)
Rules for Past Perfect Continuous
Convert Present perfect continuous to past perfect continuous
I have been working in this company from the past 10 years
View answer
I had been working in this company from the past 10 years
Explanation -
Have been changes to had been in past continuous.
He has been eating a lot of junk food
View answer
He had been eating a lot of junk food
Explanation -
Have been changes to had been in past continuous.
We have been talking to him
View answer
We had been talking to him
Explanation -
Have been changes to had been in past continuous.
They have been fighting a lot
View answer
They had been fighting a lot
Explanation -
Have been changes to had been in past continuous.
Comparison with Simple Past,Past Continuous, Past Perfect and Past Perfect Continuous