Past Perfect Continuous Tense

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

He has been eating a lot of junk food

We have been talking to him

They have been fighting a lot

Comparison with Simple Past,Past Continuous, Past Perfect and Past Perfect Continuous