Post by navi1) He is in as good a shape as I am.
2) He is in as good a shape as I.
3) He is in as good a shape as me.
I think '3' is used, but would technically mean I am a shape.
Traditionalists insist that the right-hand side of "as ... as" must be
parallel to the left-hand side, and thus require (1) but will
grudgingly accept (2) as an example of omitting a redundant verb
across a conjunction. A modern grammar would look at the corpus
evidence and say that "as ... as" can accept a complement in the
accusative case.
Traditionalists would also strike "a" in all three sentences. You
wouldn't say *"He is in a good shape"; this sense of "shape" is
anarthrous (does not permit an article). However, phrases of the form
"as ADJ a N as" are quite common and many people who object to the
article in writing probably say it that way anyway.
-GAWollman
--
Garrett A. Wollman | "Act to avoid constraining the future; if you can,
***@bimajority.org| act to remove constraint from the future. This is
Opinions not shared by| a thing you can do, are able to do, to do together."
my employers. | - Graydon Saunders, _A Succession of Bad Days_ (2015)