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This is an area of English that I consistently have trouble with. Consider the following sentences.
- I have a couple of books on my desk.
- I have a bunch of books on my desk.
- I have a number of books on my desk.
- I have a few books on my desk.
- I have several books on my desk.
- I have many books on my desk.
How many books, give or take, do I have on my desk in each case?
[digression: one example of how I tend to get these wrong is the following: not long ago, my wife (native speaker of American English) and me were out with a few friends from out of town. At one point I said "[famous landmark] is only two hundred meters from here", to which my wife replied "no, it's more like a a couple hundred meters".]