1. In a grammar checking system, a system for establishing a correct lexical entry for a word in a sentence to permit unambiguous dictionary lookup of said word by identifying if said word is intrinsically capitalized comprising: pre-processing means for providing a modified training corpus having words that are not proper nouns or intrinsically capitalized words converted to lower case even if they are at the beginning of a sentence; means for generating two versions of said sentence in which said word appears in each version in capitalized and uncapitalized form respectively; means coupled to said modified training corpus for establishing which of said two versions is the more likely; and, means responsive to said two versions for determining by said more likely version of said sentence if said word is an intrinsically capitalized word.