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My question relates to how to create the nuance between choosing two or more
methods and knowing which should be the preferred or more suitable choice.

E.g. **"How did you know whether to do/use** 'A' or B?"

＊いつ Aか、Bどちらが使いますか。

At this point, my Japanese is incredibly limited. So I am making more of an
attempt to familiarise myself with different interrogative statements for
those times when I have such questions. Alternatively a different way to say
the same in English may have been :

**"When do you do** 'Method A' or 'Method B'? - This when is similar to 'How
do you know when'.

Thank you for all the help.
CC BY-SA 3.0
2018-04-24T11:27:51.203
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2018-04-26T08:00:33.640
2018-04-25T13:52:05.010
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question
word-choice nuances comparative-constructions
How to properly denote a nuance between comparing choices
いつ Aか、Bどちらが使いますか is unnatural.

I say いつAを使い、いつBを使いますか? If you want to emphasize which one you should use, it
would be いつAを使い、いつBを使うべきですか?
CC BY-SA 3.0
2018-04-26T07:15:09.783
58179
2018-04-26T08:00:33.640
2018-04-26T08:00:33.640
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answer