My textbook lists the forms of "do" including "doing" as auxiliary/helping verbs. I can't think of any example where it would be used as such. Can you?

  • What are you doing asking such a question? What are you doing to find an answer to this through personal research? – Cargill Nov 29 '15 at 19:02
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    @Cargill you are using the word as the main verb not the auxiliary/helping verb – user18967 Nov 29 '15 at 19:06
  • No, I can't think of any, either. – Greg Lee Nov 29 '15 at 19:06
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    And to see that user18967 is right about Cargill's comment, note that neither instance of "doing" is followed by a plain verb, as is the case when "do" is used as an auxiliary. – Colin Fine Nov 29 '15 at 22:54

No, I can't. I think your textbook is wrong. We don't use "do support" where there is another auxiliary, so the "do" only appears in the finite forms "do", "does" or "did".

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    And of course the negatives "don't," "doesn't" and "didn't." – sumelic Feb 28 '16 at 2:22

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