I'll take a crack at it. Latin is as dead [a language] as dead could be. This one is easier: as dead as could be is a comparative clause modifying the adjective, dead (the first one).
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01cite10Pieanne12cite10(Is it possible to say "I'm tired as tired can be"? and the same for the others)12br10I think I usually understand such phrases as implying that there are degrees of 01i00tired02i00-ness, 01i00bold02i01del
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01cite10Mister Micawber12cite10 with the same ramifications.12br10 I like the idea that two interpretations, two different analyses, have the same ramifications.0-
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