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Conditional clauses in Ancient Greek are clauses which start with εἰ "if" or ἐάν "if ". ἐάν can be contracted to ἤν or ἄν , with a long vowel. The "if"-clause of a conditional sentence is called the protasis, and the consequent or main clause is called the apodosis.
The negative particle in a conditional clause is usually μή , making the conjunctions εἰ μή or ἐὰν μή "unless", "if not". However, some conditions have οὐ. The apodosis usually has οὐ.
A conditional clause preceded by εἴθε or εἰ γάρ "if only" is also occasionally used in Greek for making a wish. The conjunction εἰ "if" also frequently introduces an indirect question.