1. after Verbs expressing fear or apprehension, = Lat. vereor ut, δέδοικα μὴ οὐ γένηταί τι I fear it will not be; whereas δέδοικα μὴ γένηται mean, I fear it will be. Here, μή and οὐ each retain their proper force.

2. with Inf.

3. after Verbs of hindering, denying, avoiding, needing , when μὴ οὐ resembles Lat. quin or quominus , οὐδὲν κωλύει μὴ οὐκ ἀληθὲς εἶναι τοῦτο nihil impedit quin hoc verum sit; or with the Art. οὐδὲν ἐλλείψω τὸ μὴ οὐ πυθέσθαι nihil praetermittam quominus reperiam , (Sophocles Tragicus)

4. after Verbs signifying impossibility, impropriety, reluctance , μὴ οὐ has a negative translation, δεινὸν ἐδόκεε εἶναι μὴ οὐ λαβεῖν (Herdotus Historicus); αἰσχύνη ἦν μὴ οὐ δυσπουδάζειν (Xenophon Historicus)

5. μὴ οὐ with the Partic. only after a negative, expressed or implied, δυσάλγητος γὰρ ἂν εἤν μὴ οὐ κατοικτείρων I should be hard-hearted if I did not pity, (Sophocles Tragicus)

6. = εἰ μή, except πόλεις χαλεπαὶ λαβεῖν, μὴ οὐ πολιορκία (Demosthenes Orator) (ML)