In english we may say that something happened (or will happen) on a particular day or date (eg: You can learn more about adverbs if you look it up in answers.com. Yesterday would mean you have to advance one day, the day b/f.
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Yesterday is not an adverb it is a noun. The only place where today comes before yesterday is in a dictionary. 4 days after sunday is thursday and this is the day before yesterday.
Yesterday can be an adverb, a noun, or an adjective.examplesadverb:
In a dictionary, words are arranged in alphabetical order, so.
