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Discover LudwigThe phrase "when did" is correct and can be used in written English.
You can use it when you are asking a question about a past event. Example: When did you purchase the car?.
Exact(60)
When did they?
'When did globalisation begin?'.
"When did I leave?
When did you meet?
WHEN did Salinger die?
"When did that happen?
When did you start?
WHEN did this happen?
WHEN did Pfc.
When did that occur?
WHEN did it open?
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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