. 1. We sent the merchandise you asked for. Please let us know if you haven't received it by Thursday, November ***. -- OK
2. Can parrots sing? I think they can; they are birds. (However, parrots cannot sing. In ornithological parlance, they are not tuneful; they can only squawk.) .
How would you explain the use of the present perfect "haven't received by some date"? Basically, I know two uses of present perfect: 1) to denote present pertinence and 2) an action that is continued upto the present.
Part of your response to my sentence:
1. We sent the merchandise you asked for. Please let us know if you haven't received it by Thursday, November **