Grade 9 Grammar Lesson 11 Past perfect continuous

What is the structure of past perfect continuous tense?
When do we use the past perfect continuous tense?
Can pat perfect continuous tense go together with past tense?

The past perfect continuous is formed by had been + ing form.

We use the past perfect continuous for actions that happened over a period of time.

Past perfect continuous is the past of present perfect continuous.

We can say that something had been happening for a period of time before something else happened.

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