Robert Rosenberg's distinction between a spell[ing] checker and a "grammar" 
checker is not an empty one.  
 
Regrettably, however, no good grammar checker exists because no 
natural-language grammar has yet been formalized.  Chomsky and his followers 
have made a beginning, but the two biggest problems these putative grammar 
checkers confront are those of
 
o semantic ambiguity and
 
o usage consensus.
 
What does 'raw' mean.  It may mean uncooked; as in raw carrots; it may mean 
abraded and untreated, as in raw wound; it may mean off-color, as in raw joke; 
it may mean untreated, as in raw sewage;  etc., etc.   Or again, they find 
phrases like Shakespeare's 'salad days' unintelligible. 
 
For me 'data' is the plural of 'datum'; for others it is singular.   I use 
'millenia' as the plural of 'millenium'; the New York Times uses 'milleniums'.  
 Many word processors "think" that 'nor' may occur only as the second element 
of a neither...nor pair: They treat Lincoln's "The world will little note nor 
long remember . . . ' as incorrect.
 
All of the English-, i.e., American-language grammar checkers I have 
encountered are synchronic rather than diachronic.  Confronted with an old 
disjunctive subjunctive like that of Jack in the Bean Stalk's giant, "Be he 
alive or be he dead, I'll grind his bones to make my bread", they throw up 
their hands; and most do not even understand modern counterfactual-conditional 
subjunctives like "If he were blind, he would be eligible for . . .".
 
The set of useful grammar checkers, which should be called usage checkers 
instead, is currently empty.  
 
John Gilmore Ashland, MA 01721-1817 USA


                                          
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