I find contractions unappealing in written form, so I would likely not choose wisely between them. However, “I suggest that you not do that,” sounds better; and “I suggest that you don’t do that,” sounds wrong. “I suggest you don’t do that,” sounds better to my ear.
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wilpeter“I suggest that you not do that,” sounds better;That may be true of NAmE, but it is not true of BrE, in my opinion.
wilpeter“I suggest that you don’t do that,” sounds wrong.That sounds OK to my British ear.
fivejedjonThat may be true of NAmEWould you tell me what “NAmE” stands for please?
AnonymousWould you tell me what “NAmE” stands for please?
AnonymousWould you tell me what “NAmE” stands for please?North American English.
wilpeterthat" serve in the sentence, "I suggest that you don't do that."Do you find that, "I suggest you don't do that" is incomplete? In BrEI also thought that the inclusion of “that” was optional so was surprised to hear that it was wrong!
Anonymouswas surprised to hear that it was wrong!I think you may be misinterpreting something. It's not wrong to omit 'that', but some people prefer to include it.
CalifJimI think you may be misinterpreting something. It's not wrong to omit 'that', but some people prefer to include it.I said I thought the use of “that” in that sentence was optional, not wrong, and was surprised to hear that “wilpeter” said it was wrong, before “fj’s” comment, in that sentence!