1. The problem is to understand when to use "fewer" versus "less" in English grammar. 2. The rule is: use "fewer" with countable nouns (things you can count individually) and "less" with uncountable nouns (things measured in bulk or quantity). 3. For example, "fewer apples" is correct because apples can be counted. 4. "Less water" is correct because water is uncountable. 5. So, if you are talking about a number of items, use "fewer"; if you are talking about an amount or quantity, use "less". 6. This helps make your sentences grammatically correct and clear.