When is it possible to use past perfect instead of past perfect progressive to show that the action is still in progress?
I was just looking for more examples like the one below where either form can be used.
When the action began before the time of speaking in the past, and continued up to that time, or stopped just before it, we can often use either form. SOURCE
It was now six and he was tired because he had worked since dawn＝It was now six and he was tired because he had been working since dawn.
I think in my examples they can't be used interchangeably.
I had been eating dinner, when the doorbell rang. (The action is still in progress now, or has just ended)
I had eaten dinner, when the doorbell rang. (A finished action)
I had been cleaning my place when she arrived. (The action is still in progress now, or has just ended)
I had cleaned my place when she arrived. (A finished action)
I had eaten and I had cleaned imply that the actions have finished, but I need to show that they are still in progress.
I think I should remove 'now' and write that the action was still in progress at that moment in the past and it didn't finish or finished just before it or just finished.