Is a sentence such as "He felt cold, so very cold" a proper one, or is it fragmented? Is the comma correct here? Other, similar examples would be "He always made such a problem out of everything, such a dispute", "He ran fast, so very fast" and "It was such a task, such an ordeal." I thought this was a correct form, but the grammar checker is complaining, so I'm not sure.
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Let it complain.
It's ok.
Grammar checkers don't know nothin'...
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It's not incorrect, and I wouldn't call it fragmented, but I think using a dash would be more logical than using a comma. We use a dash at the end of a sentence to add relevant information that seems not to connect to the rest of the sentence in a typically grammatical way. We can use a dash in the middle of a sentence as well to include relevant information that breaks up the grammatical flow of