NEW ANALYTICAL INSIGHTS INTO THE FOREIGN LANGUAGE BEING TAUGHT CAN BE HELPFUL TO THE LANGUAGE TEACHER. TWO SUCH CONCEPTS, "ENATION" AND "AGNATION," ARE PRESENTED IN H.A. GLEASON'S "LINGUISTICS AND ENGLISH GRAMMAR.""ENATION" IS THE GRAMMATICAL RELATIONSHIP OF TWO SENTENCES WHICH HAVE THE SAME GRAMMATICAL STRUCTURE BUT ARE UNRELATED IN MEANING. ONE CAN BE CONVERTED INTO THE OTHER BY THE PROCESS OF SUBSTITUTION. TEACHING STUDENTS TO APPLY THIS PROCESS IS THE BASIS FOR SUBSTITUTION DRILLS. OTHER SENTENCES HAVE BOTH SEMANTIC AND GRAMMATICAL RELATIONSHIPS, SUCH AS A SENTENCE IN THE ACTIVE VOICE WHICH CAN BE CONVERTED TO THE PASSIVE VOICE AND VICE VERSA. THE TWO-WAY RELATIONSHIP OF THESE SENTENCES IS "AGNATION," AND STUDENTS CAN BE TAUGHT TO CONVERT THEM INTO CORRESPONDING "AGNATE" SENTENCES THROUGH TRANSFORMATION DRILLS. USING THESE CONCEPTS TO EXPLAIN DIRECT AND REFLEXIVE OBJECTS IN GERMAN IS ONLY ONE EXAMPLE BY WHICH TEACHERS CAN HELP STUDENTS HAVE A BETTER UNDERSTANDING OF GRAMMAR. THIS ARTICLE WAS PUBLISHED IN THE "FLORIDA FL REPORTER," VOLUME 4, NUMBER 3, SPRING 1966. (AM)