They might continue by saying "[one of your] best/worst/favorite/least-favorite/best-loved/most-hated" or something similar. Do you have a grammar theory?
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Yes, MrMaranatha, you have described well the reason why a singular noun is incorrect in that situation. Yet I do hear people use one incorrectly, and I even see it in writing, as I did here on HP just before posting the Q. I'm curious to know why?
My guess would be that It's just poor grammar.
Definitely poor grammar! I wonder how such a thing comes about. What is it people hear - or don't hear - that makes it sound even remotely reasonable to their ear? As you noted, "one of" indicates that there have to be more. Thanks for answering.
In the case of Foreign Language students this problem could stem from the difference in how the native language handles its own Grammar. Sometimes we see these issues with students, but after they have seen a few good examples it is usually solved.
This may take too much space (sorry). I do not mean the verb is singular. I mean that some people now incorrectly say (to play off your example), "I bought one of your Amazon book," rather than "books" Why? I admit this is not a great example.
People learn grammar unconsciously by vague imitation. If not trained in discipline of standard grammar, we guess at what to do. People hear "one" and guess "singular."Poor education, bad habit, non-standard dialect. Read Twice As Less, Eleanor Orr.
In original learning, Another element in this is that Missing Content must be supplied by the human brain. If a person hears or understands only half the sentence then the brain will supply the missing pieces thus rendering the sentence wrong.
The key is in 'books'. Amazon sells not one but many books, so the phrase has to be therefore: 'One of Amazon's books' (uno de los libros de Amazon)