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Discover LudwigThe phrase "when was this" is a perfectly correct and usable phrase in written English.
You can use it when asking a question about something that happened in the past. For example: I heard about the accident, but when was this?.
Exact(46)
PG: When was this?
But when was this?
When was this?
AUDIENCE: When was this?
When was this made?
HP: When was this diagnosed?
Similar(14)
WHEN is this likely to happen?
When is this coming in?
–When is this holiday celebrated?
How and when is this important?
When is this going to stop?
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com