Protasis and Apodosis
The **protasis** supplies the condition; the **apodosis** is the main clause related to it. Clause order can vary, and an element can be implicit. An apodosis may be an assertion, question, directive, or verbless predication, not only a predicted consequence. In common patterns, **εἰ** introduces an indicative or optative protasis and **ἐάν** introduces a subjunctive protasis. Read the complete construction, not just the opening particle.
**Matthew 4:3, excerpt** — **εἰ υἱὸς εἶ τοῦ Θεοῦ, εἰπὲ ἵνα οἱ λίθοι οὗτοι ἄρτοι γένωνται.** ("If you are the Son of God, tell these stones to become bread"). εἶ is present indicative in the protasis. The apodosis begins with εἰπέ, a second-person singular aorist active imperative (accented εἰπὲ in this continuous quotation). The following ἵνα clause depends on the command.
Form First: Particles, Mood, Tense, and Context
Identify four cues together: **particle**, **mood**, **tense-form**, and **ἄν**. Then locate the protasis and apodosis and ask how the condition works in the discourse. Indicative does not guarantee actuality; subjunctive does not supply a probability percentage; optative does not always mean a remote future. Past indicative forms in counterfactual constructions can retain past reference or support a present counterfactual reading. The same mood may appear in different constructions, so the forms of both clauses and context matter.
First-Class Conditions (εἰ + Indicative)
The conventional **first-class** pattern has **εἰ + indicative** in the protasis, with a variable apodosis. Read the whole sentence to distinguish it from the counterfactual pattern in §57.4, which also has an indicative protasis. A first-class apodosis need not be indicative: Matthew 4:3 has an imperative, and 1 Corinthians 15:12 has a question. The premise may be affirmed, conceded, explored, or rejected in the discourse. Neither objective truth nor a fixed speaker attitude follows from the class label alone.
**1 Corinthians 15:13, excerpt** — **εἰ δὲ ἀνάστασις νεκρῶν οὐκ ἔστιν, οὐδὲ Χριστὸς ἐγήγερται** ("But if there is no resurrection of the dead, neither has Christ been raised"). The indicative premise is used to draw out the consequence of the claim mentioned in verse 12. Verse 20 affirms the resurrection; the conditional form therefore cannot mean that Paul endorses the premise.
Second-Class Conditions (εἰ + Secondary Indicative)
The conventional **second-class** pattern uses **εἰ + secondary indicative** in the protasis and a secondary indicative in the apodosis, commonly with **ἄν**, to present a counterfactual relation. Secondary forms include imperfect, aorist, and pluperfect. Do not say that these forms never refer to past time: context determines whether the counterfactual concerns a present state, a past situation, or different times in the two clauses. Absence of ἄν does not by itself exclude a counterfactual reading; John 15:22 supplies an example. Describe the construction without inserting an imaginary Greek particle.
**John 11:21, excerpt** — **Κύριε, εἰ ἦς ὧδε, ὁ ἀδελφός μου οὐκ ἂν ἐτεθνήκει.** ("Lord, if you had been here, my brother would not have died"). The saved HBS BYZ04 text has imperfect indicative ἦς and pluperfect active indicative ἐτεθνήκει, not an aorist apodosis. Both are read with past reference in Martha’s counterfactual statement. John 15:22 has aorist ἦλθον/ἐλάλησα and imperfect εἶχον, with no overt ἄν.
Third-Class Conditions (ἐάν + Subjunctive)
The **third-class** pattern has **ἐάν + subjunctive** in the protasis; its apodosis can take different forms. Future and general conditions share this pattern. The construction does not assign a fixed probability or independently guarantee fulfillment. In 1 John 1:9, a general application to confession is a contextual reading, not an inherent meaning of the subjunctive. Separate the main clause from further subordinate clauses within it.
**1 John 1:9, excerpt** — **ἐὰν ὁμολογῶμεν τὰς ἁμαρτίας ἡμῶν, πιστός ἐστι καὶ δίκαιος, ἵνα ἀφῇ ἡμῖν τὰς ἁμαρτίας** ("If we confess our sins, he is faithful and just to forgive us our sins"). The protasis contains ὁμολογῶμεν, present active subjunctive, first plural. The apodosis begins πιστός ἐστι καὶ δίκαιος, with present indicative ἐστι. A following ἵνα clause contains aorist active subjunctive ἀφῇ, third singular. Whatever finer account is given of that ἵνα clause, ἀφῇ is not the main-clause verb.
Fourth-Class Conditions (εἰ + Optative)
The conventional **fourth-class / future-less-vivid** pattern has **εἰ + optative** in the protasis and **optative + ἄν** in the apodosis. Recognizing this pattern does not assign a numerical likelihood. The NT examples here demonstrate optative protases with different apodoses, not the full paired pattern.
In **1 Peter 3:14**, πάσχοιτε is present active optative, second plural, and μακάριοι supplies a **verbless apodosis** ('blessed [are you]'). The conditional sentence is complete in sense: calling its optative protasis a partial instance of the classical pattern does not make the sentence a fragment. **1 Peter 3:17** has present active optative θέλοι, third singular, within εἰ θέλοι τὸ θέλημα τοῦ Θεοῦ. The optative is a living grammatical form in these passages; do not reduce it to a dead remnant. See Chapter 35.
**1 Peter 3:14, excerpt** — **ἀλλ᾽ εἰ καὶ πάσχοιτε διὰ δικαιοσύνην, μακάριοι.** ("But even if you should suffer for righteousness, blessed [are you]"). The protasis is optative and concessive; the apodosis is verbless. It is not an optative + ἄν apodosis, yet it is a complete conditional statement.
Future Conditions
**Future reference** is distinct from **future morphology**. Compare ἐάν with subjunctives in John 14:3 and εἰ with a future indicative in 1 Corinthians 3:14. Both concern what follows a condition; the future indicative alone does not make a premise certain or establish a fixed likelihood. Read the complete clauses and temporal context.
**1 Corinthians 3:14, excerpt** — **εἴ τινος τὸ ἔργον μενεῖ ὃ ἐπῳκοδόμησε, μισθὸν λήψεται** ("If anyone’s work which he built remains, he will receive a reward"). μενεῖ is future active indicative; λήψεται is future middle indicative. In John 14:3 the future-oriented protasis instead contains aorist subjunctives πορευθῶ and ἑτοιμάσω. Subjunctive aorist does not make that protasis a past event.
General Conditions
A **general condition** states a relation applying across instances: 'if/whenever X, Y'. This is a contextual interpretation of the whole construction. General conditions are not confined to one tense-form. John 11:9 has a present subjunctive, while Mark 3:24 has an aorist subjunctive in a general proposition. The aspectual distinction remains, but neither tense-form independently counts repetitions.
**Mark 3:24, excerpt** — **ἐὰν βασιλεία ἐφ᾽ ἑαυτὴν μερισθῇ, οὐ δύναται σταθῆναι ἡ βασιλεία ἐκείνη** ("If a kingdom is divided against itself, that kingdom cannot stand"). μερισθῇ is aorist passive subjunctive, third singular. This general proposition directly disproves a rule restricting general conditions to the present subjunctive.
Present General Conditions
**Present general** describes the application of a conditional relation, not a requirement that every protasis verb have present morphology. John 11:9 illustrates present subjunctive περιπατῇ with present indicative προσκόπτει; compare the aorist subjunctive in §57.8. Habitual or gnomic interpretation belongs to the whole context. Matthew 6:16 begins with temporal ὅταν, not conditional ἐάν: related 'whenever' meanings do not erase that syntactic distinction.
**John 11:9, excerpt** — **ἐάν τις περιπατῇ ἐν τῇ ἡμέρᾳ, οὐ προσκόπτει** ("If anyone walks in the day, he does not stumble"). περιπατῇ is present active subjunctive, third singular, and προσκόπτει is present active indicative. The saying presents a general relationship.
Past General Conditions
**Past general** concerns recurrent past situations. Classical descriptions include εἰ + optative with an imperfect apodosis, as well as εἰ + imperfect with an imperfect apodosis; neither pattern should be imposed as the only form. In the NT, related past repetition also appears in relative constructions such as Mark 6:56. Identify the actual conjunction and mood rather than converting every English 'whenever' into an εἰ protasis.
**Mark 6:56, excerpt** — **καὶ ὅπου ἂν εἰσεπορεύετο εἰς κώμας ἢ πόλεις ἢ ἀγρούς, ἐν ταῖς ἀγοραῖς ἐτίθεσαν τοὺς ἀσθενοῦντας** ("And wherever he entered villages or towns or fields, they would place the sick in the marketplaces"). ὅπου ἄν with imperfect middle/passive indicative εἰσεπορεύετο introduces an iterative relative clause. Imperfect active indicative ἐτίθεσαν describes the associated repeated action. This is a comparison for past recurrence, not a quoted εἰ-condition.
Mixed Conditions
**Mixed condition** is used for combinations that differ from a conventional paired pattern, and sometimes for a condition and consequence concerning different times. State which sense you mean. A first-class condition with an imperative apodosis is already a normal permitted pattern, not automatically an anomaly. Acts 8:31 combines an ἐάν-subjunctive condition with a potential optative question. Analyze each clause rather than forcing every sentence into a single memorized pair.
**Acts 8:31, excerpt** — **πῶς γὰρ ἂν δυναίμην, ἐὰν μή τις ὁδηγήσῃ με;** ("For how could I, unless someone guides me?"). δυναίμην is present middle/passive optative, first singular, in a potential question with ἄν. ὁδηγήσῃ is aorist active subjunctive, third singular, in the ἐὰν μή condition. The apodosis precedes the protasis.
Implied Conditions
A discourse can express a **conditional implication** without an overt εἰ/ἐάν protasis. Recover only what the context warrants, and distinguish an interpretive paraphrase from missing words in the Greek text. Potential or counterfactual ἄν can accompany an implicit condition, but ἄν is neither required for every implicit relation nor proof of one uniquely recoverable 'if' clause. Hebrews 9:25–26 illustrates an 'otherwise' inference without ἄν.
**Hebrews 9:26, excerpt** — **ἐπεὶ ἔδει αὐτὸν πολλάκις παθεῖν ἀπὸ καταβολῆς κόσμου** ("For otherwise he would have had to suffer repeatedly since the foundation of the world"). Verse 25 supplies the rejected scenario of repeated self-offering. The English “otherwise” makes that inferred conditional relation explicit; no εἰ protasis or ἄν appears in this excerpt. ἔδει is imperfect indicative with the infinitive παθεῖν.
Concessive Conditions
**Concessive conditions** present a condition despite which the main statement holds: 'even if', or contextually 'although'. Combinations of καί with εἰ or ἐάν can serve this function, but the scope of καί and the discourse must establish it. Do not assign an exceptionless meaning from word order alone, or assume that all καί + εἰ combinations are concessive. Nor are concessive protases restricted to indicative or subjunctive: 1 Peter 3:14 uses optative πάσχοιτε.
**1 Peter 3:14, excerpt** — **ἀλλ᾽ εἰ καὶ πάσχοιτε διὰ δικαιοσύνην, μακάριοι.** ("But even if you should suffer for righteousness, blessed [are you]"). Suffering is presented as a condition that does not overturn the affirmation of blessedness. The concessive reading is grounded in this relation, not in καί alone.
Conditional Participles
A participle can carry **conditional force** ('if …'). This is **not** an automatic category: the participle's function (temporal, causal, conditional, concessive, attendant circumstance) is a **contextual analysis**, decided case by case. Treat 'conditional participle' as one reading to weigh against others (Ch 38, Ch 80.16), not as a fixed label.
**Galatians 6:9, excerpt** — **καιρῷ γὰρ ἰδίῳ θερίσομεν μὴ ἐκλυόμενοι.** ("For in due season we will reap, if we do not give up"). The conditional rendering relates not giving up to the promised reaping. ἐκλυόμενοι is a present middle/passive participle, nominative masculine plural, agreeing with the understood subject of θερίσομεν. Its morphology does not independently encode “if”; the relation is inferred from this exhortation.
εἰ in conditions and indirect questions
Conditional **εἰ** commonly introduces an indicative protasis, but it also occurs with optatives in the NT, as in 1 Peter 3:14 and 3:17. Thus εἰ does not, by itself, identify first-class syntax. It also introduces **indirect yes/no questions** ('whether'), which are not conditional protases. Mark 15:44 provides an example; see Chapter 55. Clause function, verb form, and the larger sentence determine the analysis.
**Mark 15:44, excerpt** — **ἐπηρώτησεν αὐτὸν εἰ πάλαι ἀπέθανε** ("He asked him whether he had died some time ago"). The εἰ clause supplies the content of a question. Aorist indicative ἀπέθανε does not turn this into a counterfactual condition; there is no protasis–apodosis relation.
ἐάν ('if' + subjunctive)
The standard **ἐάν + subjunctive** conditional pattern is called third class. ἐάν historically combines εἰ and ἄν. Its protasis presents a contingency; future or general application and any expectation of fulfillment depend on the whole sentence and context. Distinguish conditional ἐάν from related relative and temporal constructions, and identify the apodosis independently.
ἄν
**ἄν** has construction-dependent uses, not one universal meaning of uncertainty. With a secondary indicative in a counterfactual apodosis it contributes to that presentation (John 11:21). With an optative it forms a potential expression, including a question (Acts 8:31). In relative or temporal constructions it can mark indefinite reference; that need not mean repeated action. With past indicatives in an iterative relative construction, as in Mark 6:56, it accompanies repeated past events. Identify which clause contains ἄν, its verb form, and the discourse relation. Do not confuse iterative reference with counterfactuality merely because both can involve past indicatives.
Limitations of the Traditional Four-Class System
The four classes are useful names for formal patterns, not an exhaustive inventory or a truth/probability scale. The broad description εἰ + indicative is shared by different constructions, so classification needs the apodosis and context. Generality, concession, and temporal reference are additional dimensions, not interchangeable class labels. Some grammatical accounts organize conditions by time or discourse function instead. Use a classification consistently, state what it describes, and preserve the actual morphology when a sentence combines forms differently from the standard table.
Condition versus Assertion of Truth
A first-class condition does not, **by itself**, assert that its premise is true. Context may nevertheless show the speaker accepting it; elsewhere the premise is entertained for argument or rejected. In 1 Corinthians 15:12–20, the argument and subsequent affirmation establish Paul's commitment. Do not equate grammatical indicative with factual certainty, or assume that every εἰ sentence is a purely formal logical implication. Analyze both the grammatical dependency and its discourse purpose.
**1 Corinthians 15:20, excerpt** — **Νυνὶ δὲ Χριστὸς ἐγήγερται ἐκ νεκρῶν** ("But now Christ has been raised from the dead"). This positive assertion provides the contextual contrast to the conditional premise in verse 13. The doctrinal position is evidence from the discourse, not a criterion for assigning the grammatical class.
Paradigms
The Traditional Four Classes of Conditions (a form-based taxonomy)
Standard formal patterns; interpret both clauses and context. First-class syntax does not guarantee truth; third-class syntax does not encode a fixed probability. A complete NT condition with an optative protasis may have a different apodosis from the classical fourth-class pairing (1 Peter 3:14).
| Class | Protasis form | Apodosis form | Particles | Interpretive qualification |
| 1st | εἰ + indicative | Variable: statement, command, question, etc. | εἰ | Read the whole construction to distinguish the counterfactual pattern. Truth and commitment are contextual. |
|---|---|---|---|---|
| 2nd | εἰ + secondary indicative | Secondary indicative, commonly with ἄν | εἰ; usually ἄν in apodosis | Counterfactual presentation; present or past reference depends on the forms and context. |
| 3rd | ἐάν + subjunctive | Variable | ἐάν | Future/general applications are contextual; no fixed probability is encoded. |
| 4th | εἰ + optative | Optative + ἄν in the full classical pairing | εἰ; ἄν in apodosis | Distinguish this pairing from NT optative protases with other apodoses. 1 Peter 3:14 has a verbless apodosis. |
Chapter glossary
- εἰ — if; whether
ei
conjunction
Conditional εἰ introduces indicative or optative protases, including NT optative examples. It can also introduce an indirect yes/no question ('whether'). The larger construction determines its function.- ἐάν — if (+ subjunctive)
ean
conjunction
εἰ + ἄν; introduces the protasis with the subjunctive (third-class conditions). Marks an OPEN condition; the precise force (future/general/potential) is contextual — 'probability' is not encoded by the label.- ἄν — (particle of contingency)
an
particle
Particle interpreted with its construction: secondary indicative in counterfactual apodoses; optative in potential expressions; relative/temporal indefinite constructions; and past indicative in iterative contexts such as Mark 6:56. It is not a universal marker of uncertainty.- — protasis
syntax
The condition clause in a conditional construction, normally introduced by 'if'; it can precede or follow the apodosis, or be implicit in context.- — apodosis
syntax
The main clause related to a protasis. It may assert, ask, command, or be verbless; it need not contain an explicit 'then' or predict a consequence.- — first-class condition
syntax
Conventional εἰ + indicative protasis with a variable apodosis. Distinguish the counterfactual pattern by the whole construction. The class does not establish the premise's truth or the speaker's commitment.- — second-class condition
syntax
Conventional counterfactual pattern: εἰ + secondary indicative, with a secondary indicative apodosis commonly containing ἄν. The forms can refer to past events or support present counterfactual reference; context determines the time relation.- — third-class condition
syntax
ἐάν + subjunctive. Open/future/general contingency; force is contextual. 'Probability' is NOT mechanically encoded by the label.- — fourth-class condition
syntax
Traditional εἰ + optative protasis with optative + ἄν apodosis. NT optative protases must be distinguished from that full pairing: 1 Peter 3:14 has a complete conditional sentence with a verbless apodosis.- — general condition
syntax
A conditional relation applicable across instances. Generality is contextual, not encoded by present morphology alone. Present or aorist subjunctives can occur in present general conditions; past general patterns require separate analysis.