William Watson Goodwin, Syntax of the Moods and Tenses of the Greek Verb

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[*] 303. The clauses which are introduced by these particles, all of which are sometimes called final clauses, may be divided into three classes:—

Pure A. final clauses, in which the end or purpose of the action of any verb may be expressed; as ἔρχεται ἵνα τοῦτο ἴδῃ, he is coming that he may see this; ἀπέρχεται ἵνα μὴ τοῦτο ἴδῃ, he is departing that he may not see this; ἦλθεν ἵνα τοῦτο ἴδοι, he came that he might see this. Here all the final particles are used, but with different frequency in various classes of writers (see 311-314).

Object B. clauses with ὅπως or ὅπως μή after verbs of striving, etc.; as σκόπει ὅπως γενήσεται, see that it happens; σκόπει ὅπως μὴ γενήσεται, see that it does not happen. These clauses express the direct object of the verb of striving, etc., so that they may stand in apposition to an object accusative like τοῦτο; as σκόπει τοῦτο, ὅπως μή σε ὄψεται, see to this, viz., that he does not see you. They also imply the end or purpose of the action of the leading verb, and to this extent they partake of the nature of final clauses.

C. Clauses with μή after verbs of fearing, etc.; as φοβοῦμαι μὴ τοῦτο γένηται, I fear that this may happen; ἐφοβήθη μὴ τοῦτο γένοιτο, he feared that this might happen. These clauses have in use become object clauses, though in their origin they are of a very different nature (262; 307).