Abstract 1. Introduction 2. Theory of Symbolic structure 2.1. Wickelphones 2.2. Past-tense inflection of English Verbs 2.3. Merit of Symbolic Structure in learning theory 3. A review of past studies in Middle English verb inflection 3.1. Mosse(1968) 3.2. Brunner(1970) 3.3. Jones(1972) 4. Symbolic structure of Middle English past-tense inflection 4.1. Observation of the data in Middle English Verbs 4.2. Past-tense inflection system of Middle English Verbs 5. Conclusion Notes References