" is a sentential adverb. It serves as a modifier for the whole sentence. "unfortunately" and many other words and phrases would work the same.
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Anonymous Two of them include the phrase "according to..."What's the second one? I doubt one rule fits all.
Avangiplay the hand according to Hoyle. I'd take it as adverbial in the traditional sense.Good point.
AnonymousThe subject is not modified by the "according to" because the police would have looked into (whatever) even if the afternoon paper would not state it.Exactly!