Herbert Weir Smyth, A Greek Grammar for Colleges

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[*] 2291. This is the only functional distinction that characterizes all conditional sentences. Here are included also 2292, 2295, 2296.

1. Present

Protasis: a primary tense of the indicative.

Apodosis: any form of the simple sentence.

εἰ ταῦτα ποιεῖς, καλῶς ποιεῖς if you do this, you do well.

2. Past

Protasis: a secondary tense of the indicative.

Apodosis: any form of the simple sentence.

εἰ ταῦτα ἐποίεις, καλῶς ἐποίεις if you were doing this, you were doing well, εἰ ταῦτα ἐποίησας, καλῶς ἐποίησας if you did this, you did well.

3. Future

a. Protasis: ἐά_ν with the subjunctive.

Apodosis: any form expressing future time.

ἐὰ_ν ταῦτα ποιῇς (ποιήσῃς), καλῶς ποιήσεις if you do this, you will do well.

b. Protasis: εἰ with the future indicative.

Apodosis: any form expressing future time.

εἰ ταῦτα ποιήσεις, πείσει if you do this, you will suffer for it.

c. Protasis: εἰ with the optative.

Apodosis: ἄν with the optative.

εἰ ταῦτα ποιοίης (ποιήσειας), καλῶς ἂν ποιοίης (ποιήσειας) if you should (were to) do this, you would do well.

According to Fulfilment or Non-fulfilment