Past Perfect Continuous

We use the past perfect continuous to look back at a situation in progress.

• It was a good time to invest. Inflation had been falling for several months. 
• Before I changed jobs, I had been working on a plan to reduce production costs.
• We had been thinking about buying a new house but then we decided to stay here.

We use it to say what had been happening before something else happened.

• It had been snowing for a while before we left.
• We had been playing tennis for only a few minutes when it started raining.
• He was out of breath when he arrived because he had been running.

We use it when reporting things said in the past.

• She said she had been trying to call me all day.
• They said they had been shopping.
• I told you I had been looking for some new clothes.