This is a can of worms with which you must be careful. Generally, those phrases are unnecessary to the content and are thrown in to seem 'formal', when they are often just counterproductive. However: Kenneth G.
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Anonymouscould we say that, while 'concerning' and 'about' are close in formality and are not so 'heavy' in style, 'with regard to' and 'regarding' sound more formal?That sounds reasonable.
AnonymousI understand the different language devices but still cannot capture the differences in degrees of formality. I am using as reference some