Can we use "has been done" with future tense?

[farhankhan2007]

Hello All,


I need to know please if these sentences are grammatically correct.
Can we use "has been done" with future tense?


Please let me know once the testing has been done.
Please let me know once the testing is done.


Thank you.

 

[Matthew Wai]

The present perfect is used in adverbial clauses of time after the conjunctions 'when', 'till', 'before', 'after', 'as soon as' to denote an action completed before a definite moment in the future.
──quoted from https://www.usingenglish.com/forum/threads/72776-present-perfect-with-once?p=319156#post319156

I think 'once' is also among these conjunctions.

 

[AirbusA321]

Would "will have been done" be wrong in this context?

 

[Matthew Wai]

I would consider it wrong.

 

[Raymott]

In what sentence?

 

[Matthew Wai]

In the sentence below, presumably.

Please let me know once the testing has been done.

 

[Raymott]

No, I meant what is the full sentence once the substitution has been made?
"Please let me know once will have been done" is wrong, definitely.
"Please let me know once the sentence will have been done" is wrong.
There might be a sentence that uses "will have been done" that is correct.