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εἰ with indicative future: vivid one-off plausible condition


εἰ μὴ σιωπήσει, θενών σου ᾽κκοκκιῶ τὸ γῆρας

‘If you do not keep silent, I will knock and thrash the old age out of you.’ (Aristoph. Lys. 364)

A subordinate clause in the indicative future, introduced by εἰ, signals a one-off plausible condition as a satellite. This often happens when the speaker regards the fulfilment of the condition as 'undesirable' or 'threatening' or - on the contrary - when he vividly looks forward to the 'promised' or 'predicted' fulfilment.

Example Sentences: 

τῆς γὰρ ἐπιούσης νυκτὸς πάντα ταῦτα δεῖ πεπρᾶχθαι, εἰ δ᾽ ἔτι περιμενοῦμεν, ἀδύνατον καὶ οὐκέτι οἷόν τε.

For all this has to be done in the course of the following night, but if we delay it further, it will be impossible and we will no longer be capable of doing it.

εἰ οὖν βουλήσεσθε, τὰ δίκαια καὶ τὰ συμφέροντα ὑμῶν ποιησάντων, φιλοτιμότερον ἡμεῖς ἕξομεν τοὺς παρανομοῦντας ἐξετάζειν

So if you do what is righteous and advantageous, then, if you so wish, we will be able to interrogate transgressors more zealously. ֍

ἀπωλόμεσθ’ ἄρ’, εἰ κακόν προσοίσομεν νέον παλαιῷ.

If we must heap a new misfortune on her old one, we are lost.

σὺ δ’ εἴ τι δράσεις τῶνδε , μὴ σχολὴν τίθει.

If you want to contribute in this matter, get to work.

εἰ γάρ μ’ ἀπώσει, σὺν κακῷ μέτει πάλιν.

If you reject me now, you will soon miserably return to me.

σὺ δέ, εἰ σωφρονήσεις, ὦ φίλη, δράσεις τάδε.

If you are sensible, my dear, you will act in this way.