The textbook exercise raises expressions such as 'sun' and 'this sun'. Do not classify them merely because one sun is familiar in everyday life. First identify what the speaker means.
If 'a sun' denotes a general kind of stellar body capable of multiple instances, the concept is universal.
If 'this sun' picks out one particular known sun, it is particular. In ordinary speech 'the Sun' may already refer to the one familiar astronomical object; context then governs the classification.
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The sun and this sun: meaning matters
Universal and Particular — Definitions and Practical Classification
The textbook exercise raises expressions such as 'sun' and 'this sun'. Do not classify them merely because one sun is familiar in everyday life. First identify what the speaker means.
If 'a sun' denotes a general kind of stellar body capable of multiple instances, the concept is universal.
If 'this sun' picks out one particular known sun, it is particular. In ordinary speech 'the Sun' may already refer to the one familiar astronomical object; context then governs the classification.