I don’t see real difference between Past Perfect Progressive and Past Progressive… Can anyone shed some light on that? what is the differ...

In these type of tenses, they mean about emphasis, which means past perfect progress wants to emphasis in the duration of time in the past,

Thank you very much @marroking99!!! It is much clear now!

Hi Augusto. Past progressive indicates continuing action, something that was happening at some point in the past" while Past Perfect Progressive is used to indicate a continuous action that was completed at some point in the past". 👌