A day or in a day: what's the difference?

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Sandrin_Curandera

Member
Russian
Hello everyone!

Can you explain me the difference between "a day" and "in a day"? For example, there are two similar sentences:
He drinks coffee three times a day.
A lion may eat about 43 kg of meat in a day.

Thanks.
 
  • entangledbank

    Senior Member
    English - South-East England
    In the second sentence, you could omit 'in'. It would be the same. In the first, 'n times a day' (times a year etc.) is a fixed expression, and we wouldn't add 'in'.

    cross-posted: adding this:

    Habitual. 'May eat' is habitual, in the sense that it's possible every day. If the lion ate 40 kg of meat in a day, that was in one specific day, and is not the same as the habitual '40 kg of meat a day'.
     

    Sandrin_Curandera

    Member
    Russian
    Thanks for answers, but I have one more question about the theme.

    In the second sentence, you could omit 'in'. It would be the same. In the first, 'n times a day' (times a year etc.) is a fixed expression, and we wouldn't add 'in'.
    Okey, and what about such sentence: my dad usually drinks three cups of coffee ... a day/in a day? Does "a day" use only with "n times" o may be used when we speak about everyday actions?
     
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