Specifically, I'm interested in concepts and conceptual development from the view of linguistic semantics and language acquisition.  Ray Jackendoff talks about the relation between conceptual and semantic structure quite a bit.  His definition of 'concept' seems to be a mental representation that can serve as the meaning of a linguistic expression.  This seems to work for nouns (e.g. 'dog' denotes the concept DOG), but what are we to make of verbs?  What about temporal forms?  Does the English past-tense marker, '-ed,' express the concept PAST?  What about modal forms?  Does the English epistemic modal auxiliary 'might' express the concept POSSIBILITY?

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