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Discover LudwigThe phrase "ascertain which" is correct and usable in written English.
It can be used when you want to determine or find out a specific option or choice among several possibilities.
Example: "We need to ascertain which method will yield the best results for our project."
Alternatives: "determine which" or "find out which".
Exact(59)
A very friendly chap was trying to ascertain which covers we had purchased.
But when dealing with an individual it is important to ascertain which term they prefer, and to stick with it.
Griffith-Jones concluded that nobody should be prosecuted, as it was impossible to ascertain which guards had inflicted which blows.
In the end, though, it was difficult to ascertain which players might have elevated their stock.
The results could help ascertain which features of this "zoo of possibilities" are more common and which are more rare, and how many solutions really are too many.
"Persons who wish to criticize and comment on them cannot ascertain which sites are contained in the lists unless they circumvent," the ruling said.
Students will be able to ascertain which educational programs are likely to pay off.
SnackFeed: SnackFeed indexes premium video content on the web and tries to ascertain which shows will interest you the most.
Disaggregation of the hazard calculations can ascertain which events dominate the hazard at a particular site.
Therefore, it is difficult ascertain which is the main cause for the decrease in HDS activity.
Is there a reliable way to ascertain which standpoint is normatively more authoritative than others?
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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