Fragment of a three-sided tripod base, possibly a Roman choregic monument. 1st-2nd c. A.D. Athenian Agora Excavations. Key Terms and Concepts THE PERFECT SYSTEM COMPLETED ASPECT REDUPLICATION PERFECT TENSE STEM –κ– MARKER FOURTH PRINCIPAL PART FIFTH PRINCIPAL PART Chapter Navigation Key Terms and Concepts Introduction to the Perfect System Formation of the Perfect Active Personal Endings: Active Formation of the Perfect Middle Perfect Infinitives Principal Parts 4, 5, and 6 Exercises 42 Book Nav Classical Readings 41.2: Aeschylus Seven against Thebes 245-63 Introduction to the Perfect System