Herbert Weir Smyth, A Greek Grammar for Colleges

γράφω ἵνα ἐκμάθῃς I write (on this account) that you may learn.

γράφω ἵνα μὴ ἐκμάθῃς I write (on this account) that you may not learn.

ἔγραψα ἵνα ἐκμάθοις (or ἐκμάθῃς) I wrote (on this account) that you might learn.

ἔγραψα ἵνα μὴ ἐκμάθοις (or ἐκμάθῃς) I wrote (on this account) that you might not learn.

““κατάμενε ἵνα καὶ περὶ σοῦ βουλευσώμεθα” remain behind that we may consider your case also” X. A. 6.6.28, ““βασιλεὺς αἱρεῖται οὐχ ἵνα ἑαυτοῦ καλῶς ἐπιμελῆται, ἀλλ᾽ ἵνα καὶ οι᾽ ἑλόμενοι δι᾽ αὐτὸν εὖ πρά_ττωσι” a king is chosen, not that he may care for his own interest however nobly, but that those who choose him may prosper through him” X. M. 3.2.3, ““παρακαλεῖς ἰ_α_τροὺς ὅπως μὴ ἀποθάνῃ” you call in physicians in order that he may not die” X. M. 2.10.2. φύλακας συμπέμπει (hist. pres., 1883) . . . ““ὅπως ἀπὸ τῶν δυσχωριῶν φυλάττοιεν αὐτόν” he sent guards along in order that they might guard him from the rough parts of the country” X. C. 1.4.7. ““καὶ ἅμα ταῦτ᾽ εἰπὼν ἀνέστη ὡς μὴ μέλλοιτο ἀλλὰ περαίνοιτο τὰ δέοντα” and with these words on his lips he stood up in order that what was needful might not be delayed but be done at once” X. A. 3.1.47, ““μὴ σπεῦδε πλουτεῖν μὴ ταχὺς πένης γένῃ” haste not to be rich lest thou soon become poor” Men. Sent. 358. For the optative after an optative, see 2186 c.