People who are careful about their grammar take extra care with “less” and “fewer.” Most of the time, the results are good. “Ben has fewer worries this year” sounds better than “Ben has less worries ...
In the English as in most but not all languages (i.e. Chinese) number can be extracted from the noun leaving a lexical-propositional form of the noun. From book and books we get object predicate: 1.
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