Hi again, I don't quite understand what you mean by 'changing into subtlety'? I know all those notions below but I have no idea what you're asking about. Could you explain that to me so I can help you?
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MrPedantica term ("subtle"?) seems to be missing after "changing".Oh! You may be right that Soumaya meant just that.
soumaya1. conversion in morphology is a shift in word class. Right!
2. inflection in morphology is changing grammatical purposes. Yes, that's roughly correct. What's important is that inflexion doesn't change the class of the word that undergoes some inflectional modifications.