Ought - English editing.

The verb ought is a modal verb, which means that it does not behave grammatically like ordinary verbs. In particular, the negative is formed with the word not alone and not with auxiliary verbs such as do or have. Therefore the standard construction for the negative is he ought not to have gone. The alternative forms he didn’t ought to have gone and he hadn’t ought to have gone, formed as though ought were an ordinary verb rather than a modal verb, are found in dialect from the 19th century but are not acceptable in standard English.
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