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past perfect continuous and Past perfect - Coggle Diagram
past perfect continuous and Past perfect
past perfect
structure
Affirmative
S + Had + Past Participle
Negative
S + Had + Not + Past Participle
Question
Had + S + Past Participle
Use
We use the perfect past to refer to an action or event that started in the past and that is prior to another action also in the past.
Time expression
Already
Yet
For
Since
Just
Before
Until
After
Past perfect continuous
structure
Affirmative
S + had + been+ Verb-ing
Negative
S + had + not + been+ Verb-ing
Question
Had + S + been+ Verb-ing
Use
The "past perfect continuous" is used for an action that was being performed or occurring in the past before another action that was already past.
Time expression
When
Before
By the time
For
Since