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Difference among “per”, “each” and “every”


Difference between “each” and “every”which one is the most correct answer?Do synonyms have exactly the same meanings as each other in all contexts?What are the differences between “seems not” and “doesn't seem”?Difference in the usage? ; It “can / could / must” be something seriousWhat's the difference between “established” and “founded”What's the difference between these two?Is ‘Where did you be born’ ok?“Once each” or “once every” six months?When do we use each of these (in/on/at)?






.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty margin-bottom:0;








-1















Can you tell me which ones are grammatically correct and why?



Students must study for 20 hours per week.
Students must study for 20 hours each week.
Students must study for 20 hours every week.



Students must study 20 hours per week.
Students must study 20 hours each week.
Students must study 20 hours every week.



I am also not sure is it necessary to have "for" after study.



Please help thank you.










share|improve this question







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    -1















    Can you tell me which ones are grammatically correct and why?



    Students must study for 20 hours per week.
    Students must study for 20 hours each week.
    Students must study for 20 hours every week.



    Students must study 20 hours per week.
    Students must study 20 hours each week.
    Students must study 20 hours every week.



    I am also not sure is it necessary to have "for" after study.



    Please help thank you.










    share|improve this question







    New contributor




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






















      -1












      -1








      -1








      Can you tell me which ones are grammatically correct and why?



      Students must study for 20 hours per week.
      Students must study for 20 hours each week.
      Students must study for 20 hours every week.



      Students must study 20 hours per week.
      Students must study 20 hours each week.
      Students must study 20 hours every week.



      I am also not sure is it necessary to have "for" after study.



      Please help thank you.










      share|improve this question







      New contributor




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












      Can you tell me which ones are grammatically correct and why?



      Students must study for 20 hours per week.
      Students must study for 20 hours each week.
      Students must study for 20 hours every week.



      Students must study 20 hours per week.
      Students must study 20 hours each week.
      Students must study 20 hours every week.



      I am also not sure is it necessary to have "for" after study.



      Please help thank you.







      differences






      share|improve this question







      New contributor




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











      share|improve this question







      New contributor




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









      share|improve this question




      share|improve this question






      New contributor




      Supphanat is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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      asked 1 hour ago









      SupphanatSupphanat

      1




      1




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      New contributor





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