To make negative statements in the Past Perfect Continuous, use:

 

had not been + the “-ing” form of the verb

 

Singular	Plural
I had not been sleeping You hadn’t been sleeping He/she/it hadn’t been sleeping	We hadn’t been sleeping You hadn’t been sleeping They hadn’t been sleeping

 

 

Mary decided to buy a new juicer because her old one hadn’t been working for years.

 

He hadn’t been studying for 5 months before he was expelled from the university.

 

I hadn’t been training hard enough and lost the fight.