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Is the above question grammatically correct?

How about "When should we use one not the other?"

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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.

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Thanks!

I need some clarification.

Can't I say "When to use which?" as a shortcut way to ask? How about "I don't know when to use which."?

Your quoted example is different from what I actually wrote. I wonder what you actually refers to.

I said 'How about "When should we use one not the other?"'.

You said ' healer
How about "When should we use one rather than the other?"

Yes, something like this would be the full way to say it.'

healerCan't I say "When to use which?" as a shortcut way to ask? How about "I don't know when to use which."?

"When to use which?" is an abbreviated way of asking a question such as "When should I/we use one rather than the other?".

"I don't know when to use which" is not a question, and does not literally mean the same thing, though in some contexts it may imply that you want the answer to such a question.

healerYour quoted example is different from what I actually wrote. I wonder what you actually refers to.

I suggested a small improvement to the wording of your sentence.

Thanks for the clarification.

I am aware that "I don't know when to use which" is not a question. I gave that as an example because you said "when to use which" is not a grammatically full sentence. How about "When do I use which?" Is this grammatically correct?

Anyway I accept your suggested improvement to my sentence though.

Thanks a lot!

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healerHow about "When do I use which?" Is this grammatically correct?

Yes, that is a full sentence.

Thanks for all your help!