Reduplication is the unique prefix given to perfect tense verbs in Greek. cf. vocalic reduplication.

If a verb begins with a single consonant, that consonant is reduplicated and the two consonants are separated by an epsilon.

λυω (present tense) becomes λελυκα (perfect tense).

ποιεω (present tense) becomes πεποιηκεν (perfect tense).


If the consonant that was reduplicated is φ, χ, or θ then the reduplicated consonant will change to π,κ, or τ respectively. cf. BBG 25.8.

φανεροω (present tense) becomes πεφανερωκα (perfect tense)

τιθημι (present tense) becomes τέθειται (perfect tense).

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