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Bookmark or Share- When to use "am not" and "do not" in a sentenceIn negative situations, do is used as an auxillary (or helper) verb when denying something, e.g. "I do not know." This is because *"I not know" is not grammatical. Do-support is only used with the infinitive, i.e. the form of verb that matches its name. So you say "I do not know", never *"I do not knowing". "He does not know", never *"He does ...
- grammaticality - "Whether or not" vs. "whether" - English Language ...This will depend on whether or not he's suitable for the job. It is still not defined whether we're following that approach. It is still not defined whether we're following that approach or not. It is still not defined whether or not we're following that approach. "Or not" doesn't really seem to be needed to complement "whether".
- "Have not" versus "do not have" - English Language & Usage Stack Exchange*I do not have run all the way to Manchester from London. As user1579 points out, this distinction comes about because have is being used as a main verb where X is a noun, but an auxiliary verb where X is a verb phrase.
- "He doesn't" vs "He don't" - English Language & Usage Stack ExchangeHe does not eat meat. He do not eat meat. Now we can see very clearly that the latter is grammatically incorrect. Whether you should use doesn't or don't depends on whether the subject is singular or plural: He doesn't speak French. They don't speak French.
- questions - "do you not" vs "do not you" - English Language Learners ...There's no grammar that results in Do not you think, so that word order is ungrammatical. You can't "uncontract" don't in example 4. Don't make the mistake of thinking you can replace don't with the uncontracted do not. That's not how English question formation works.
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