Past Perfect Continuous Tense

Description-

The past perfect continuous tense (also known as the past perfect progressive tense) shows that an action that started in the past continued up until another time in the past. The past perfect continuous tense is constructed using had been + the verb’s present participle (root + -ing).

Unlike the present perfect continuous, which indicates an action that began in the past and continued up to the present, the past perfect continuous is a verb tensethat indicates something that began in the past, continued in the past, and also ended at a defined point in the past.

Kindly look the below given Example-

He had been drinking milk out the carton when Mom walked into the kitchen.