I could buy it yesterday, wrong?












1















I just learned that I should not say:



I could buy it yesterday.



but rather use “was able” or “could have”.



At the same time, I have just seen a sentence:
He could help me but he did not.
That is correct?










share|improve this question





























    1















    I just learned that I should not say:



    I could buy it yesterday.



    but rather use “was able” or “could have”.



    At the same time, I have just seen a sentence:
    He could help me but he did not.
    That is correct?










    share|improve this question



























      1












      1








      1








      I just learned that I should not say:



      I could buy it yesterday.



      but rather use “was able” or “could have”.



      At the same time, I have just seen a sentence:
      He could help me but he did not.
      That is correct?










      share|improve this question
















      I just learned that I should not say:



      I could buy it yesterday.



      but rather use “was able” or “could have”.



      At the same time, I have just seen a sentence:
      He could help me but he did not.
      That is correct?







      grammaticality modal-verbs subjunctives






      share|improve this question















      share|improve this question













      share|improve this question




      share|improve this question








      edited 13 hours ago









      SamBC

      4,719322




      4,719322










      asked yesterday









      John VJohn V

      456313




      456313






















          2 Answers
          2






          active

          oldest

          votes


















          3














          It depends on context if the subjunctive mood is required or not



          If you had already purchased a product yesterday, and today it's not available, then, "I could buy it yesterday," is a statement of fact, and grammatically correct. It could also be written as "I could buy it yesterday and I did."



          On the other hand, if you had seen the product yesterday but not bought it, and today it's not available, then, "I could have bought it yesterday," using the subjunctive mood is needed. That is, "I could have bought it yesterday and didn't, and now I cannot."






          share|improve this answer
























          • Just so that this has been said... don't announce that you did things like that unless you know the person enjoys pretending that there's time travel that goes somewhere other than towards tomorrow. There are some people who really hate this.

            – Ed Grimm
            yesterday











          • Thanks, and what anout “He could help me but he did not“?

            – John V
            20 hours ago











          • @EdGrimm But doesn't also depend on the context? What about a sentence: I saw the book in the shop last week already, so he could definitely buy it yesterday.

            – John V
            19 hours ago











          • That still sounds like you want could have rather than could, unless he actually did and you're being annoying, or you know he has a time machine.

            – Ed Grimm
            19 hours ago











          • @EdGrimm Ah..and it is the same case here? (Sentence I found):She came from the USA the day before yesterday so Mike could meet her yesterday. But I have no idea whether they met. // or could have met her?

            – John V
            19 hours ago



















          1














          Maybe by some prescriptivist grammars, I could buy it yesterday doesn't work. It probably breaks some rules; lots of things do.



          It is, however, absolutely normal in every dialect that I'm familiar with. It is generally equivalent to the more formally correct "I could have bought it yesterday".






          share|improve this answer

























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            2 Answers
            2






            active

            oldest

            votes








            2 Answers
            2






            active

            oldest

            votes









            active

            oldest

            votes






            active

            oldest

            votes









            3














            It depends on context if the subjunctive mood is required or not



            If you had already purchased a product yesterday, and today it's not available, then, "I could buy it yesterday," is a statement of fact, and grammatically correct. It could also be written as "I could buy it yesterday and I did."



            On the other hand, if you had seen the product yesterday but not bought it, and today it's not available, then, "I could have bought it yesterday," using the subjunctive mood is needed. That is, "I could have bought it yesterday and didn't, and now I cannot."






            share|improve this answer
























            • Just so that this has been said... don't announce that you did things like that unless you know the person enjoys pretending that there's time travel that goes somewhere other than towards tomorrow. There are some people who really hate this.

              – Ed Grimm
              yesterday











            • Thanks, and what anout “He could help me but he did not“?

              – John V
              20 hours ago











            • @EdGrimm But doesn't also depend on the context? What about a sentence: I saw the book in the shop last week already, so he could definitely buy it yesterday.

              – John V
              19 hours ago











            • That still sounds like you want could have rather than could, unless he actually did and you're being annoying, or you know he has a time machine.

              – Ed Grimm
              19 hours ago











            • @EdGrimm Ah..and it is the same case here? (Sentence I found):She came from the USA the day before yesterday so Mike could meet her yesterday. But I have no idea whether they met. // or could have met her?

              – John V
              19 hours ago
















            3














            It depends on context if the subjunctive mood is required or not



            If you had already purchased a product yesterday, and today it's not available, then, "I could buy it yesterday," is a statement of fact, and grammatically correct. It could also be written as "I could buy it yesterday and I did."



            On the other hand, if you had seen the product yesterday but not bought it, and today it's not available, then, "I could have bought it yesterday," using the subjunctive mood is needed. That is, "I could have bought it yesterday and didn't, and now I cannot."






            share|improve this answer
























            • Just so that this has been said... don't announce that you did things like that unless you know the person enjoys pretending that there's time travel that goes somewhere other than towards tomorrow. There are some people who really hate this.

              – Ed Grimm
              yesterday











            • Thanks, and what anout “He could help me but he did not“?

              – John V
              20 hours ago











            • @EdGrimm But doesn't also depend on the context? What about a sentence: I saw the book in the shop last week already, so he could definitely buy it yesterday.

              – John V
              19 hours ago











            • That still sounds like you want could have rather than could, unless he actually did and you're being annoying, or you know he has a time machine.

              – Ed Grimm
              19 hours ago











            • @EdGrimm Ah..and it is the same case here? (Sentence I found):She came from the USA the day before yesterday so Mike could meet her yesterday. But I have no idea whether they met. // or could have met her?

              – John V
              19 hours ago














            3












            3








            3







            It depends on context if the subjunctive mood is required or not



            If you had already purchased a product yesterday, and today it's not available, then, "I could buy it yesterday," is a statement of fact, and grammatically correct. It could also be written as "I could buy it yesterday and I did."



            On the other hand, if you had seen the product yesterday but not bought it, and today it's not available, then, "I could have bought it yesterday," using the subjunctive mood is needed. That is, "I could have bought it yesterday and didn't, and now I cannot."






            share|improve this answer













            It depends on context if the subjunctive mood is required or not



            If you had already purchased a product yesterday, and today it's not available, then, "I could buy it yesterday," is a statement of fact, and grammatically correct. It could also be written as "I could buy it yesterday and I did."



            On the other hand, if you had seen the product yesterday but not bought it, and today it's not available, then, "I could have bought it yesterday," using the subjunctive mood is needed. That is, "I could have bought it yesterday and didn't, and now I cannot."







            share|improve this answer












            share|improve this answer



            share|improve this answer










            answered yesterday









            DrMoishe PippikDrMoishe Pippik

            1,23247




            1,23247













            • Just so that this has been said... don't announce that you did things like that unless you know the person enjoys pretending that there's time travel that goes somewhere other than towards tomorrow. There are some people who really hate this.

              – Ed Grimm
              yesterday











            • Thanks, and what anout “He could help me but he did not“?

              – John V
              20 hours ago











            • @EdGrimm But doesn't also depend on the context? What about a sentence: I saw the book in the shop last week already, so he could definitely buy it yesterday.

              – John V
              19 hours ago











            • That still sounds like you want could have rather than could, unless he actually did and you're being annoying, or you know he has a time machine.

              – Ed Grimm
              19 hours ago











            • @EdGrimm Ah..and it is the same case here? (Sentence I found):She came from the USA the day before yesterday so Mike could meet her yesterday. But I have no idea whether they met. // or could have met her?

              – John V
              19 hours ago



















            • Just so that this has been said... don't announce that you did things like that unless you know the person enjoys pretending that there's time travel that goes somewhere other than towards tomorrow. There are some people who really hate this.

              – Ed Grimm
              yesterday











            • Thanks, and what anout “He could help me but he did not“?

              – John V
              20 hours ago











            • @EdGrimm But doesn't also depend on the context? What about a sentence: I saw the book in the shop last week already, so he could definitely buy it yesterday.

              – John V
              19 hours ago











            • That still sounds like you want could have rather than could, unless he actually did and you're being annoying, or you know he has a time machine.

              – Ed Grimm
              19 hours ago











            • @EdGrimm Ah..and it is the same case here? (Sentence I found):She came from the USA the day before yesterday so Mike could meet her yesterday. But I have no idea whether they met. // or could have met her?

              – John V
              19 hours ago

















            Just so that this has been said... don't announce that you did things like that unless you know the person enjoys pretending that there's time travel that goes somewhere other than towards tomorrow. There are some people who really hate this.

            – Ed Grimm
            yesterday





            Just so that this has been said... don't announce that you did things like that unless you know the person enjoys pretending that there's time travel that goes somewhere other than towards tomorrow. There are some people who really hate this.

            – Ed Grimm
            yesterday













            Thanks, and what anout “He could help me but he did not“?

            – John V
            20 hours ago





            Thanks, and what anout “He could help me but he did not“?

            – John V
            20 hours ago













            @EdGrimm But doesn't also depend on the context? What about a sentence: I saw the book in the shop last week already, so he could definitely buy it yesterday.

            – John V
            19 hours ago





            @EdGrimm But doesn't also depend on the context? What about a sentence: I saw the book in the shop last week already, so he could definitely buy it yesterday.

            – John V
            19 hours ago













            That still sounds like you want could have rather than could, unless he actually did and you're being annoying, or you know he has a time machine.

            – Ed Grimm
            19 hours ago





            That still sounds like you want could have rather than could, unless he actually did and you're being annoying, or you know he has a time machine.

            – Ed Grimm
            19 hours ago













            @EdGrimm Ah..and it is the same case here? (Sentence I found):She came from the USA the day before yesterday so Mike could meet her yesterday. But I have no idea whether they met. // or could have met her?

            – John V
            19 hours ago





            @EdGrimm Ah..and it is the same case here? (Sentence I found):She came from the USA the day before yesterday so Mike could meet her yesterday. But I have no idea whether they met. // or could have met her?

            – John V
            19 hours ago













            1














            Maybe by some prescriptivist grammars, I could buy it yesterday doesn't work. It probably breaks some rules; lots of things do.



            It is, however, absolutely normal in every dialect that I'm familiar with. It is generally equivalent to the more formally correct "I could have bought it yesterday".






            share|improve this answer






























              1














              Maybe by some prescriptivist grammars, I could buy it yesterday doesn't work. It probably breaks some rules; lots of things do.



              It is, however, absolutely normal in every dialect that I'm familiar with. It is generally equivalent to the more formally correct "I could have bought it yesterday".






              share|improve this answer




























                1












                1








                1







                Maybe by some prescriptivist grammars, I could buy it yesterday doesn't work. It probably breaks some rules; lots of things do.



                It is, however, absolutely normal in every dialect that I'm familiar with. It is generally equivalent to the more formally correct "I could have bought it yesterday".






                share|improve this answer















                Maybe by some prescriptivist grammars, I could buy it yesterday doesn't work. It probably breaks some rules; lots of things do.



                It is, however, absolutely normal in every dialect that I'm familiar with. It is generally equivalent to the more formally correct "I could have bought it yesterday".







                share|improve this answer














                share|improve this answer



                share|improve this answer








                edited 13 hours ago

























                answered yesterday









                SamBCSamBC

                4,719322




                4,719322






























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