Koinè

-ῃ and -ει are found in the pres. fut. mid. and pass., fut. perf. pass. ε-(σ)αι yields ῃ (written EI in the Old Attic alphabet, 2 a), which is usually given as the proper spelling in the texts of the tragic poets, whereas ει is printed in the texts of prose and comedy. ει was often written for ηι (ῃ) after 400 B.C., as in ἀγαθεῖ τύχει, since both had the sound of a close long e. It is often impossible to settle the spelling; but βούλει wishest, οἴει thinkest, and ὄψει shalt see (from ὁράω) have only the -ει forms. -ει is sometimes called Attic and Ionic in contrast to -ῃ of the other dialects, including the Koiné.