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Blackcheetah Posted 13 years ago
Grammar

"once "and "once in"

I am quite familar with "once a day"r, "once a week",but not "once in a day"?Howerver , a sentence in my article"The effluent pH and TP were determined once a day",was changed by the editor into"...........once in a day"?
Is there any difference between "once "and "once in"? thank you in advance of.
  

Top answer

blackcheetah Is there any difference between "once "and "once in"? thank you in advance of. Yes.

— Fivejedjon

  • blackcheetah Is there any difference between "once "and "once in"?
  • thank you in advance of.
  • Yes.
  • 'Once a day' is natural; 'once in a day' is normally not.
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6 Answers
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blackcheetahIs there any difference between "once "and "once in"? thank you in advance of.
Yes. 'Once a day' is natural; 'once in a day' is normally not.
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But "once in a day","once in a week" ect. are also popular in network. For example:
1. What Happens if You Only Brush Your Teeth Once in a Day? a title in "eHow health."website.
2. there is a song called "once in a day"
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The Corpus of Contemporary American English has 556 citations for 'once a day' and just two for 'once in a day'. 'Once in a day' is not impossible, but it is clearly far less common than 'once a day'.
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Thank you for your kindness! Do you think I should insist my sentence and not use "once in a day"?
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In a scientific article, "once per day" referring to the frequency of a measurement, is apporpriate.
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Thank you very much! Wish you happy Christmas in advance!
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