In the sentence: "So amazed he cannot speak", is "amazed" an adjective?
closed as not constructive by J.R., FumbleFingers, kiamlaluno, Robusto, tchrist Aug 8 '12 at 2:58
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Yes, X has to be an adjective in the predicate construction
where S is any tensed clause (in this case, S = he cannot speak).
If it were a noun phrase, one would use such (a) instead of so
Both of these mean that the degree of X is high enough to bring about S.
Per the comments, if the sentence was expanded to