Thangvietnam, we contrast "fewer" and "less" as I discussed above, but not "few" and "less." Let me show some usages:
Fewer = a smaller number of something (a comparative word)
We have fewer visitors this week than we did last week.
My wife has fewer papers on the desk than I do.
There are five fewer men than women at the party.
Less = a smaller measurement or quantity of something (a comparative word)
I have less money than my brother.
If I had taken less time on question 7, I might have done better on the exam.
Cycling requires less upper body strength than rock climbing.
Few = a small number of something (not a comparative word)
We have had few visitors this week.
Few of my friends enjoy spicy food.
A few of my friends enjoy spicy food.
Note that these last two have different implications. When I say "few of my friends," I mean "not very many of my friends." I am emphasizing the small number. When I say "a few of my friends," I mean "several of my friends." I am emphasizing the fact that some friends *do* like spicy food.
I hope this list helps. Let me know if you had something else in mind, or if you have other questions.
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Dmitry Farber | Manhattan GMAT Instructor | New York
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