3. Do you know the difference between 'less' and 'fewer'? Which choice is correct?
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Answer:
Joan wanted less butter on her toast
Let's get this straight - a simple rule to differentiate:
if you can count it, use 'fewer', as in fewer jobs, fewer people, fewer ideas;
if you can't count it, use 'less', as in less fun, less trouble, less mess.
If you notice the examples, I did not use 'fewer' as an incorrect choice because it sounded silly, e.g., fewer butter, fewer incentive; so the problem is the overuse of 'less' which, in this case, seems to create more errors.
If you can calculate the amount of the noun you are using, don't use less, use fewer, as in giving fewer examples.