Tenses >> Past perfect continuous tense

Structure of past perfect continuous
I'd (I had) been working hard.	I hadn't (had not) been working hard.	Had you been working hard?

Past perfect continuous - common mistakes
Common mistakes	Correct version	Why?
I had working 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 worked hard, so I felt very tired.
I had been hearing the song many times before.	I had heard the song many times before.	Some verbs are not normally used in the continuous form, e.g. stative verbs such as know, like, understand, believe, hear, etc.

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