Aorist Indicative Passive
Introduction
The aorist passive indicative is translated in this way:
…τῇ ναυμαχίᾳ τῇ πρὸς Ἀλέξανδρον ἐνικήθητε…
…you were defeated in the naval battle against Alexander…
—Demosthenes, On the Trierarchic Crown 8
The verb ἐνικήθητε above is segmented like this: ἐ/νικα/θη/τε.
The marker of the aorist passive is /θη/ or /η/. Your textbook may say that the marker is /θ/, but this is incorrect.
To conjugate the aorist passive, use default athematic personal markers:
| ἐ/ or L/ | BASE | /θη/ or /η/ | /ν /μεν /ς /τε /ø /σαν |