Is the above question grammatically correct?
How about "When should we use one not the other?"
" is not a grammatically full sentence, but in the right context it makes sense as abbreviated English. " Yes, something like this would be the full way to say it.
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"When to use which?" is not a grammatically full sentence, but in the right context it makes sense as abbreviated English.
healerHow about "When should we use one rather than the other?"
Yes, something like this would be the full way to say it.