The past progressive tense follows this structure:
To create the past perfect progressive, on needs the auxiliary verbs had & been and a present participle. Present participles always ending in -ing.The verb run in the past perfect progressive is had been running.
Past progressive tense.
The past progressive (past continuous) is "was visiting." (were visiting) The past perfect progressive is "had been visiting."
There are two types:Past progressive tensePast perfect progressive tense
The past progressive tense of study is:I/He/She/It was studying.You/We/They were studying.
The past progressive of think is was/were thinking. The past perfect of see is had seen.
the form of the past tense are past progressive,past perfect progressive,past perfect simple.
Was/were starting is the past progressive tense of start.
Present progressive, past progressive, and future progressive
Past simple - I laughed. Past progressive - I was laughing.
The past progressive of "stop":I was stoppingWe were stoppingYou were stoppingHe/she was stoppingThey were stopping
The past perfect progressive of investigate is had been investigating.