A subordinate clause may play the part of a substantive in relation to the main clause. Such clauses are generally the object, sometimes the subject, of the verb of the main clause.
εἶπεν ὅτι οὐ πόλεμον ποιησόμενοι ἥκοιεν
ἔπρα_σσον ὅπως τις βοήθεια ἥξει
δέδοικα μὴ . . . ἐπιλαθώμεθα τῆς οἴκαδε ὁδοῦ
There are four main divisions of substantive clauses.
1. Dependent Statements: subordinate clauses stating that something is; as
λέγει ὡς οὐδέν ἐστιν ἀδικώτερον φήμης
2. Dependent Clauses of will or desire: subordinate clauses denoting that something should be or should be done. These clauses have been treated under the following divisions:
a. Dependent clauses after
b. Dependent clauses after
N.—On dependent voluntative clauses with the accusative and infinitive (indirect petition), see cross1991 ff.
3. Dependent Questions: subordinate clauses asking a question; both parts of the sentence together forming a statement; as
ἠρώτων ὅ τι ἐστὶ τὸ πρᾶγμα
4. Dependent Exclamations: subordinate clauses setting forth an exclamation; both parts of the sentence together forming a statement; as
διαθεώμενος αὐτῶν ὅσην μὲν χώρα_ν καὶ οἵα_ν ἔχοιεν
Herbert Weir Smyth [n.d.], A Greek Grammar for Colleges; Machine readable text [info] [word count] [Smyth].