The phrase "had already left" is grammatically correct.
The phrase "had already been gone" is not grammatically correct.
Been to means having already gone to and now left or returned from, while gone can mean you are already there or are on your way.
been there focus on destination. gone there focus on the trip.
"I have gone to China" answers the question Where are you?"I have been to China" answers the question Where have you been?
had gone and has been gone are in past . had gone is sometime before he or she had gone but has been gone is long time before . had gone is compared to gone and has been gone is the superlative of all....
You say he is gone when you do not expect him to come back.
difference between didnt go and hadnt gone . didnt go is past tense while hadnt gone was used as past perfect continuous tense.
This event has already been and gone.
goo gone removes things
went is the past tense
It has already been stopped. It has been gone since 1985.
Both are generally asking the same question. They just contain different grammar constructions.
Was is preterit. Gone! Clean cut. Has been is past "participle", of participate? That is, the emotion of the past act carries into the present, drags into the present as it is remembered and talked about.