νᾶφε καὶ μέμνασο ἀπιστεῖν → keep a clear head and remember not to believe a thing (Epicharmus fr. 250)
P. and V. οἴεσθαι; see suppose.
I ween: use particle, P. and V. που (enclitic), δήπου, Ar. and P. δήπουθεν.