RECT DISCOURSE.

Conditional Sentences of the First Type.

319. A. THE APODOSIS. Any tense of the Indicative is changed to the
corresponding tense of the Infinitive (Sec. 270; 317, a).

B. THE PROTASIS. The protasis takes those tenses of the Subjunctive which
are required by the Sequence of Tenses.

Examples:--

DIRECT. INDIRECT.
si hoc credis, erras, dico, si hoc credas, te errare;
dixi, si hoc crederes, te errare.
si hoc credes, errabis, dico, si hoc credas, te erraturum
esse;
dixi, si hoc crederes, te erraturum
esse.
si hoc credideris, errabis, dico, si hoc crederis, te erraturum
esse;
dixi, si hoc credidisses, te erraturum
esse.
si hoc credebas, erravisti, dico, si hoc crederes, te erravisse;
dixi, si hoc crederes, te erravisse.

a. Note that a Future Perfect Indicative of the Direct Discourse
regularly appears in the Indirect as a Perfect Subjunctive after a
principal tense, and as a Pluperfect Subjunctive after an historical
tense.

Conditional Sentences of the Second Type.

320. A. THE APODOSIS. The Present Subjunctive of the Direct Discourse
regularly becomes the Future Infinitive of the Indirect.

B. THE PROTASIS. The Protasis takes those tenses of the Subjunctive
demanded by the sequence of tenses.

Examples:--

si hoc credas, erres, dico, si hoc credas, te erraturum
esse;
dixi, si hoc crederes, te erraturum
esse;

Conditional Sentences of the Third Type.

321. A. THE APODOSIS.

1. The Imperfect Subjunctive of the Direct Discourse becomes the Future
Infinitive.

a. But this construction is rare, being represented in the classical
Latinity by a single example (Caesar, V. 29. 2). Some scholars question
the correctness of this passage.

2. The Pluperfect Subjunctive of the Direct Discourse becomes:--

a) In the Active Voice the Infinitive in -urus fuisse.

b) In the Passive Voice it takes the form futurum fuisse ut with the
Imperfect Subjunctive.

B. THE PROTASIS. The protasis in Conditional Sentences of this type always
remains