Use of 3rd person present tense when combined with “not only”





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I'm confused why the use of "increases" in the following sentence is incorrect --- I intuitively think it should be "increase" instead, but can't quite explain why I think so.




High consumption of trans fat is dangerous: not only does it increases
your LDL cholesterol level, it also decreases your HDL cholesterol.




My confusion is exacerbated by the fact that "high consumption of trans fat is dangerous: it increases your LDL cholesterol level" seems grammatically correct, and the use of "decreases" in the sentence above also seems correct.










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    up vote
    1
    down vote

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    I'm confused why the use of "increases" in the following sentence is incorrect --- I intuitively think it should be "increase" instead, but can't quite explain why I think so.




    High consumption of trans fat is dangerous: not only does it increases
    your LDL cholesterol level, it also decreases your HDL cholesterol.




    My confusion is exacerbated by the fact that "high consumption of trans fat is dangerous: it increases your LDL cholesterol level" seems grammatically correct, and the use of "decreases" in the sentence above also seems correct.










    share|improve this question







    New contributor




    Vincent Tjeng is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
    Check out our Code of Conduct.






















      up vote
      1
      down vote

      favorite









      up vote
      1
      down vote

      favorite











      I'm confused why the use of "increases" in the following sentence is incorrect --- I intuitively think it should be "increase" instead, but can't quite explain why I think so.




      High consumption of trans fat is dangerous: not only does it increases
      your LDL cholesterol level, it also decreases your HDL cholesterol.




      My confusion is exacerbated by the fact that "high consumption of trans fat is dangerous: it increases your LDL cholesterol level" seems grammatically correct, and the use of "decreases" in the sentence above also seems correct.










      share|improve this question







      New contributor




      Vincent Tjeng is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.











      I'm confused why the use of "increases" in the following sentence is incorrect --- I intuitively think it should be "increase" instead, but can't quite explain why I think so.




      High consumption of trans fat is dangerous: not only does it increases
      your LDL cholesterol level, it also decreases your HDL cholesterol.




      My confusion is exacerbated by the fact that "high consumption of trans fat is dangerous: it increases your LDL cholesterol level" seems grammatically correct, and the use of "decreases" in the sentence above also seems correct.







      grammaticality






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      Vincent Tjeng is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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      share|improve this question







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      Check out our Code of Conduct.









      share|improve this question




      share|improve this question






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      asked 12 mins ago









      Vincent Tjeng

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      1061




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      Vincent Tjeng is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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