Past perfect continuous tense

Structure of past perfect continuous
positive negative question
I / you / he / she / it / we / they
had been going.
I / you / he / she / it / we / they
hadn’t been going.
Had
I / you / he / she / it / we / they
been going?
Past perfect continuous – common mistakes
Common mistakes Correct version Why?
I had working hard, so I felt very tired.
I had been worked hard, so I felt very tired.
I had been working hard, so I felt very tired. The form of the past perfect continuous is had + been + verb (-ing).
I had been hearing the song many times before. I had heard the song many times before. Some verbs (called stative verbs) are not normally used in the continuous form, e.g. know, like, understand, believe, hear, etc.

Practise this grammar

Upper-intermediate exercise: past perfect simple vs. continuous