[1719.] Sometimes the subjunctive serves as a main sentence: see [1762]; sometimes a noun of the verb: see [1766].
[MOOD OF THE SUBORDINATE SENTENCE.]
[1720.] The indicative and the subjunctive are both used in subordinate sentences, as will be shown in the treatment of the several words of subordination. Some general uses may be mentioned collectively here.
[THE INDICATIVE MOOD.]
[1721.] The indicative is ordinarily used in sentences introduced by a relative pronoun, or by a causal conjunctive word other than cum.
pontem, quī erat ad Genāvam, iubet rescindī, 1, 7, 2, he orders the bridge which was near Geneva torn up. concēdō, quia necesse est, RA. 145, I give up, because I have to. In sentences of this class, however, the subjunctive is often required, particularly in indirect discourse ([1722]), or in cases of attraction ([1728]).
[THE SUBJUNCTIVE MOOD.]
The Subjunctive of Indirect Discourse and of Attraction.
[1722.] The subjunctive is used in relative, causal, temporal, and conditional sentences in indirect discourse, and in cases of attraction.