If it tells what day you're talking about, it's a noun: today is Thursday, Today is really warm. If it tells when something happens, it's an adverb: He arrived today. When it modifies a noun, it functions as an adjective: this is today's paper.
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PhilipWhen it modifies a noun, it functions as an adjective: this is today's paper.Functions as an adjective but it's again a noun. You can't add genetive "s" to an adjective. This is analagous to "Peter's paper" or "the school's paper".
shugao today is an adverb or a noun Is today an adverb in any of these sentences.If so, why?What's the date today?He's going to ring you at some point today.Today is even hotter than yesterday!Is that today's paper?He left today, which is a Tuesday, so he should be back today.It seems to me you can call it a noun all the time. It's just that the noun "today"
AnonymousA preposition tells you when something happens.No.