γνοίης ὅσσον ὄνων κρέσσονες ἡμίονοι → you know how much better are donkeys from mules
P. and V. ὀφείλειν.
I ought: use also P. and V. πρέπει με or μοι, προσήκει με or μοι, χρή με.
See anything, aught.
