All information in a text is signaled linguistically. The successful demonstration of comprehension skill must therefore depend upon a correct interpretation of the linguistic signals in the text. Linguistic relationships of various kinds are set up between sentences which contribute to the overall cohesion of a text, including lexical relationships of inclusion or hyponymy and equivalence or synonymy, syntactic relationships of anaphoric reference as well as of comparison, nominal and verbal substitution and summary words, and logical relationships marked by the use of logical connectors. The implication which can be drawn is that the above-mentioned language features must be taught to the student at the intermediate and advanced stages in a systematic and purposeful way, just as sentence grammar was taught systematically in the elementary stage.
