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

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[*] 304. Although the object clauses of class B partake slightly of the nature of final clauses, so that they sometimes allow the same construction (the subjunctive for the future indicative), still the distinction between classes A and B is very strongly marked. An object clause, as we have seen, can stand in apposition to a preceding τοῦτο; whereas a final clause would stand in apposition to τούτου ἕνεκα, as ἔρχεται τούτου ἕνεκα, ἵνα ἡμῖν βοηθήσῃ, he comes for this purpose, viz., that he may assist us. The two can be combined in one sentence; as σπουδάζει ὅπως πλουτήσει, ἵνα τοὺς φίλους εὖ ποιῇ, he is eager to be rich, that he may benefit his friends.

Care must be taken not to mistake the nature of an object clause with ὅπως when its subject is attracted by the leading verb; as σκόπει τὴν πόλιν ὅπως σωθήσεται for σκόπει ὅπως ἡ πόλις σωθήσεται, see that the city is saved. So also when an object clause of the active construction becomes a subject clause in the equivalent passive form; as ἐπράττετο ὅπως συμμαχίαν εἶναι ψηφιεῖσθε, it was brought about that you should vote to have an alliance made ( AESCHIN. iii. 64), which represents the active construction ἔπραττον ὅπως ψηφιεῖσθε.