Future Active & Middlethe σ formative — what will be, what shall be

Your current toolkit:

• Lessons 10–13 — the present-tense system.
• Lesson 14 — imperfect (past, ongoing).
• Lessons 15–16 — first and second aorist (past, snapshot).
• Lesson 17 — aorist passive and future passive (using the θη formative).

This lesson covers the future active and middle. (You already know the future passive from Lesson 17 — bonus!) The future is formed by inserting a tense formative σ between the verb stem and the regular present-tense endings. So λύω "I loose" becomes λύσω "I will loose." It's almost always that simple — though a class of "liquid" verbs (stems ending in λ μ ν ρ) take a slightly different formative, which we'll cover.

One important note: the future has no augment. The augment is a past-time marker only. Future, present, and perfect verbs never carry it.

Greek's future is the simplest of the major tenses to form. The basic recipe:

verb stem + σ + present endings

That's it. No augment (the future is not past). No special endings (it borrows the present-system endings). Just stem + σ + ending.

For λύω ("I loose"), the future active 1sg is λύσω ("I will loose"). Compare:

The combination of stem-final consonant + σ produces these standard outcomes:

Labials (π, β, φ) + σ → ψ — γράφω → γράψω ("I will write"); βλέπω → βλέψω ("I will see"); τρίβω → τρίψω.

Velars (κ, γ, χ) + σ → ξ — διώκω → διώξω ("I will pursue"); ἄγω → ἄξω; ἄρχω → ἄρξω.

Dentals (τ, δ, θ) drop before σ — πείθω → πείσω ("I will persuade"); σπεύδω → σπεύσω.

Contract verbs (ending in -άω, -έω, -όω) cause headaches in the present because the stem vowel contracts with the personal ending. In the future, the σ acts as a buffer: the contract vowel lengthens to match the σ, then everything proceeds normally.

The lengthening pattern:

α → η before σ (so ἀγαπάω → ἀγαπήσω)

ε → η before σ (so φιλέω → φιλήσω)

ο → ω before σ (so πληρόω → πληρώσω)

Greek phonology disliked σ next to liquids. Where you'd expect, e.g., μένσω, the σ drops and a contraction with ε occurs, producing μενῶ (with circumflex).

The result: liquid futures look like contract presents. They have the contracted endings: -ῶ, -εῖς, -εῖ, -οῦμεν, -εῖτε, -οῦσι(ν).

The most important liquid futures in NT:

The Greek future expresses what will be — but in NT theology, "what will be" is often God's promise of what God will do. The future is not vague optimism; it is grounded commitment by a God who keeps covenant.

Major future-tense theological landmarks:

"You will conceive in your womb and give birth to a son, and you will call his name Jesus" (Luke 1:31). Three futures: συλλήμψῃ, τέξῃ, καλέσεις. Mary is told what will be — and what is told her becomes reality because the speaker is God's messenger.

"He will save his people from their sins" (Matt 1:21). σώσει — future of σῴζω. Jesus's mission stated in advance.

"You will receive power when the Holy Spirit comes upon you, and you shall be my witnesses" (Acts 1:8). λήμψεσθε (future deponent of λαμβάνω) and ἔσεσθε (future of εἰμί). Promise + commission, both in the future.

"And the dead in Christ will rise first" (1 Thess 4:16). ἀναστήσονται — eschatological future. The dead don't rise yet; they will rise. The future tense here carries the weight of the resurrection hope.