The katakana form's ジ sound comes from two bases: from "sh," as in "sheep" AND
from the "ch" sound in "cheese." When I am asked to identify the character,
during study, that is producing the ジ sound, I never know which answer is
correct or why. Is there some kind of rule for making the distinction? Thank
you.

How do I know, for Katakana, whether it is シ plus ダクテン or チ plus ダクテン which is
forming the ジ sound?
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2019-07-16T18:41:11.500
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2019-07-16T20:15:46.433
2019-07-16T20:15:46.433
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question
kana spelling phonology morphology kana-usage
Changing from "S" to "Z" sound in Katakana