Are 'Yesterday,' 'Today', and 'Tomorrow' Nouns or Adverbs?
Are the words yesterday, today, and tomorrow adverbs or nouns? Oxford Living Dictionaries identifies all three words as an adverb first and a noun second. Etymonline lists yesterday as a noun and adverb but today and tomorrow as only adverbs. Wiktionary defines today and tomorrow as adverbs first and nouns second but yesterday as a noun first and an adverb second. Dictionary.com categories yesterday and today as an adverb, noun, and adjective but tomorrow as only a noun and adverb. How can multiple dictionaries analyze the same three words differently, and what is the best word class for words like
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