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εἴπῃς

Γελᾷ δ' ὁ μωρός, κἄν τι μὴ γέλοιον ᾖ -> The fool laughs even when there's nothing to laugh at
Menander

French (Bailly abrégé)

épq. εἴπῃσθα;
2ᵉ sg. ao.2 sbj. de ἔπω.

Russian (Dvoretsky)

εἴπῃς: = εἴπῃσθα.