I believe, unlike BrE, "on" is not necessary in AmE.
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clarenceduring her performance Wednesday eveningCorrect as shown. "on" is optional.
clarence Wondering if there is any reason why it is not used earlier but used here.Lack of proofreading for consistency.
clarence for American usage, it would have been all right grammatically to omit 'on' in both instances OR to include 'on' in both instancesAnd in BrE, as far as I know.
clarence the former is more common and more acceptable?No; it is just less formal.
Mister Micawberclarence for American usage, it would have been all right grammatically to omit 'on' in both instances OR to include 'on' in both instancesAnd in BrE, as far as I know.I am using British English, but I have never seen prepositions omitted in BrE.
tamguatlayI am using British EnglishI thought you were using Singaporean English.