Characteristics of Athematic Conjugation
The term **athematic** refers to a formation in which endings attach without the ordinary intervening **ο/ε thematic vowel**. Several high-frequency root-class -μι present systems show three important patterns: (1) direct athematic inflection; (2) present-system reduplication, as in **δί-δω-μι, τί-θη-μι, ἵ-στη-μι**; and (3) root-class vowel gradation, e.g. **δίδωμι** beside **δίδομεν**. These are **not universal properties of every -μι lexeme**. The -νυmi class, represented by **δείκνυμι**, builds its present stem differently, and other tense systems of the same verbs may follow other morphological patterns.
Reduplicated Present Stems
Several classic **root-class -μι verbs** form their present system with reduplication that belongs to the **present stem**, not to the perfect: **δω- → δί-δω-μι**, **θε- → τί-θη-μι**, **στα- → ἵ-στη-μι**. This present-system reduplication is a subclass pattern, not the definition of all -μι verbs. In particular **δείκνυμι** belongs to the **-νυ-** class and does not derive its present through this reduplicated-root process. Present-system reduplication must also be kept distinct from the perfect-system reduplication of Chapter 28.
δίδωμι ('I give')
**δίδωμι** ('I give') is a principal model of the reduplicated root -μι class. Its present system shows the characteristic contrast **δίδωμι, δίδως, δίδωσι(ν)** versus **δίδομεν, δίδοτε, διδόασι(ν)** in the traditional paradigm. Its aorist **ἔδωκα** is a **special -κα aorist formation**, not an ordinary sigmatic first aorist with an irregular spelling. High-frequency -μι verbs such as δίδωμι, τίθημι, and ἵημι preserve special aorist formations that should be learned with their principal parts rather than forced into the ordinary λύω pattern.
**John 3:16** — …τὸν υἱὸν αὐτοῦ τὸν μονογενῆ **ἔδωκεν** ('…he **gave** his one-and-only Son') — ἔδωκεν = 3 sg. aorist of δίδωμι.
**John 13:34** — ἐντολὴν καινὴν **δίδωμι ὑμῖν** ('A new commandment **I give you**') — δίδωμι = 1 sg. present.
τίθημι ('I put, place')
**τίθημι** ('I put, place, lay') — present **τίθημι, τίθης, τίθησι(ν), τιθέμεν, τιθέτε, τιθέασι(ν)** (long η sg., short ε pl.). Aorist **ἔθηκα**. The verb is theologically important: God 'sets' Jesus (Rom 9:32-33); 'lay down one's life' (τίθημι τὴν ψυχήν, John 10:11).
**John 10:11** — ἐγώ εἰμι ὁ ποιμὴν ὁ καλός· ὁ ποιμὴν ὁ καλὸς τὴν ψυχὴν αὐτοῦ **τίθησιν** ὑπὲρ τῶν προβάτων ('I am the good shepherd; the good shepherd lays down his life for the sheep') — τίθησιν = 3 sg. present of τίθημι.
ἵστημι ('I stand, set')
**ἵστημι** ('I stand / I make stand') has **transitive** ('I set, establish') and **intransitive** ('I stand') meanings, with different aorists: **ἔστησα** (transitive, 1st aor.) vs **ἔστην** (intransitive, root/second aor.). Present: **ἵστημι, ἵστης, ἵστησι(ν), ἵσταμεν, ἵστατε, ἱστᾶσι(ν)**. The perfect **ἕστηκα** ('I stand') is very common in NT narrative.
**Matt 27:11 (PT1904)** — **ὁ δὲ Ἰησοῦς ἔστη ἔμπροσθεν τοῦ ἡγεμόνος** ('And Jesus stood before the governor') — ἔστη = 3 sg. root/second-aorist active of ἵστημι, used intransitively.
ἵημι ('I send, throw')
**ἵημι** ('I send, throw, let go') is rare in the NT outside compounds (e.g. **ἀφίημι** 'I forgive, leave', **ἐξίημι**). Its forms are learned mainly to recognize the compounds. **ἀφίημι** ('forgive') is extremely common. PT1904 Mark 2:5 has **ἀφέωνταί σοι αἱ ἁμαρτίαι σου** ('your sins have been forgiven / are forgiven').
**1 John 1:9** — …πιστός ἐστιν καὶ δίκαιος, ἵνα **ἀφῇ ἡμῖν τὰς ἁμαρτίας** ('…that he may **forgive** us our sins') — ἀφῇ = 3 sg. aorist subjunctive of ἀφίημι.
δείκνυμι ('I show')
**δείκνυμι** ('I show, point out') represents the **-νυμι subclass**. Its present-system stem contains the formative **-νυ-**: **δεικ-νυ-μι**. This is structurally different from the reduplicated root presents **δίδωμι, τίθημι, ἵστημι**. The present paradigm uses characteristic -μι inflection, while other systems can follow different morphology; for example, the aorist **ἔδειξα** is an ordinary first/sigmatic aorist. The -νυ- element should therefore be analyzed as present-system morphology, not as reduplication or a whole-paradigm marker.
**John 5:20** — **ὁ γὰρ πατὴρ φιλεῖ τὸν υἱὸν καὶ πάντα δείκνυσιν αὐτῷ ἃ αὐτὸς ποιεῖ** ('For the Father loves the Son and shows him all that he himself does').
Other -νυμι Verbs
Besides **δείκνυμι**, securely attested members of the -νυmi family include **σβέννυμι** ('quench, extinguish') and **ζώννυμι** ('gird'). These verbs illustrate the **-νυ- present-system formative** while forming other tense systems according to their own principal parts. The earlier unverified examples **ῥίζνυμι** and **δαρνύμι** are not retained as established learner lexemes without reliable lexical attestation. For uncommon -νυmi vocabulary, source verification takes precedence over filling out a pattern by analogy.
Root Aorists
Some high-frequency Greek verbs form **root aorists** (bare aorist stem + endings, without the productive -σα marker): **ἔγνων** ('I knew', from γινώσκω), **ἔστην** ('I stood', from ἵστημι), **ἔβην** ('I went', from βαίνω). Root aorists are not a property of -μι verbs as a class; they are an inherited formation that must be learned verb by verb.
Athematic Participles
Athematic/root-class verbs provide several important participial forms, but they must be identified from the **relevant tense-system stem**. **διδούς, διδοῦσα, διδόν** and **τιθείς, τιθεῖσα, τιθέν** are **present active participles** of δίδωμι and τίθημι. By contrast, **θείς, θεῖσα, θέν** is an **aorist active participle** of τίθημι, and **στάς, στᾶσα, στάν** belongs to the root/athematic aorist system of ἵστημι. Active participles commonly involve -ντ- morphology, but the shared participial formation does not erase the difference between present and aorist stems. Full participial morphology is treated later in the grammar.
**Acts 17:25 (PT1904)** — **αὐτὸς διδοὺς πᾶσιν ζωὴν καὶ πνοὴν κατὰ πάντα** ('he himself giving to all life and breath in all things') — διδοὺς = nom. sg. masc. present active participle of δίδωμι.
Transition from Athematic to Thematic Patterns in Koine
Across the history of Greek, highly irregular athematic paradigms were subject to **analogical pressure and partial thematic leveling**. Koine and later Greek can therefore show competition between inherited -μι forms and more regularized patterns. This is a **diachronic tendency**, not a license to generate unattested 'hybrid' forms. In New Testament study, each claimed form must be verified in the corpus or reliable lexicographic evidence. The previously asserted **διδόετε** is not retained as an NT example without such attestation. Reconstructed or analogical possibilities must be labelled as reconstructions rather than quotations from the NT.
Paradigms
δίδωμι ('I give') — Present Active and Middle/Passive
**δίδωμι** is a model of the **reduplicated root -μι present class**: present-system reduplication (δι-), root-class vowel gradation (ω in the traditional singular pattern, ο in the plural), and athematic inflection in the relevant present system. These features are not universal to every -μι verb or every tense system.
| Person | Present active | Present middle/passive |
| 1 sg. | δίδωμι 1 sg. I give | δίδομαι |
|---|---|---|
| 2 sg. | δίδως | δίδοσαι / δίδῃ |
| 3 sg. | δίδωσι(ν) | δίδοται |
| 1 pl. | δίδομεν | διδόμεθα |
| 2 pl. | δίδοτε | δίδοσθε |
| 3 pl. | διδόασι(ν) | δίδονται |
The Five Core -μι Verbs
Comparison of four classic root/reduplicated -μι verbs (**δίδωμι, τίθημι, ἵστημι, ἵημι**) with the distinct **-νυmi present class** represented by **δείκνυμι**. The aorist column includes special -κα, root/athematic, and ordinary sigmatic formations and therefore must be classified system by system rather than as one 'irregular -μι aorist' pattern.
| Verb | Present | Aorist | Meaning |
| δίδωμι | δίδωμι | ἔδωκα special -κα aorist active | give |
|---|---|---|---|
| τίθημι | τίθημι | ἔθηκα special -κα aorist active | put, place |
| ἵστημι | ἵστημι | ἔστησα (trans.) / ἔστην (intrans.) first/sigmatic aorist vs root/athematic aorist | make stand / stand |
| ἵημι | ἵημι | ἧκα special -κα aorist active | send, throw |
| δείκνυμι | δείκνυμι | ἔδειξα ordinary first/sigmatic aorist; present belongs to -νυ class | show |
Chapter glossary
- δίδωμι — I give
didōmi
verb
Model -μι verb; reduplicated present (δί-δω-μι); aorist ἔδωκα. John 3:16 'he gave'.- τίθημι — I put, place, lay down
tithēmi
verb
-μι verb; reduplicated (τί-θη-μι); aorist ἔθηκα. 'Lay down life' (John 10:11).- ἵστημι — I stand / I make stand
histēmi
verb
-μι verb; transitive aorist ἔστησα, intransitive ἔστην; perfect ἕστηκα very common.- ἵημι — I send, throw
hiēmi
verb
-μι verb; rare alone but common in compounds (ἀφίημι 'forgive').- ἀφίημι — I forgive, leave, let go
aphiēmi
verb
Compound of ἵημι; very common: ἀφέωνταί σοι αἱ ἁμαρτίαι σου 'your sins are forgiven' (Mark 2:5, PT1904).- δείκνυμι — I show, point out
deiknymi
verb
Model -νυμι verb; aorist ἔδειξα (regular).- ἔστην — I stood
esten
verb
Second aorist (intransitive) of ἵστημι; root aorist.- — athematic (-μι) verb
verb
Athematic (-μι) verb: traditional conjugational class characterized by athematic inflection in particular present/imperfect or inherited tense-system formations, where endings attach without the ordinary ο/ε thematic vowel. Individual subclasses include reduplicated root presents and -νυmi presents; other systems of the same lexeme may use different morphology.- — thematic verb
verb
Regular -ω verb with ο/ε thematic vowel (λύω); the productive Koine conjugation.- — reduplication (-μι)
verb
Present-system reduplication used by certain root-class -μι verbs (e.g. δίδωμι, τίθημι, ἵστημι); it is part of the present stem and is distinct from perfect-system reduplication. It is not universal to all -μι verbs.- — root aorist
verb
Root/athematic aorist: an aorist formation in which endings attach to the aorist/root stem without the ordinary thematic vowel and without the ordinary -σα first-aorist formation, e.g. ἔστην, ἔγνων. Distinct from special -κα aorists such as ἔδωκα.