resent Perfect instead of the Future
Perfect.

b. In those verbs whose Perfect has Present force (Sec. 262, A) the Future
Perfect has the force of a Future; as,--

novero, _I shall know_.

Epistolary Tenses.

265. In letters the writer often uses tenses which are not appropriate at
the time of writing, but which will be so at the time when his letter is
received; he thus employs the Imperfect and the Perfect for the Present,
and the Pluperfect for the Present Perfect; as,--

nihil habebam quod scriberem, neque enim novi quidquam audieram et ad
tuas omnes epistulas jam rescripseram, _I have nothing to write, for I
have heard no news and have already answered all your letters_.

TENSES OF THE SUBJUNCTIVE.

266. A. In Independent sentences. See Sec. 272-280.

B. In Dependent Sentences. In dependent sentences the tenses of the
subjunctive usually conform to the so-called

Sequence of Tenses.

267. 1. In the Subjunctive the Present and Perfect are Principal tenses,
the Imperfect and Pluperfect, Historical.

2. By the Sequence of Tenses Principal tenses are followed by Principal,
Historical by Historical. Thus:--

PRINCIPAL SEQUENCE,--

video quid facias, _I see what you are doing_.

videbo quid facias, _I shall see what you are doing_.

videro quid facias, _I shall have seen what you are doing_.

video quid feceris, _I see what you have done_.

videbo quid feceris, _I shall see what you have done_.

videro quid feceris, _I shall have seen what you have done_.

HISTORICAL SEQUENCE,--

videbam quid faceres, _I saw what you were doing_.

vidi quid faceres, _I saw what you were doing_.

videram quid faceres, _I had seen what you were doing_.

videbam quid fecisses, _I saw what you had done_.

vidi quid fecisses, _I saw what you had done_.

videram quid fecisses, _I had seen what you had done_.

3. The Present and Imperfect Subjunctive denote incomplete action, the
Perfect and Pluperfect completed action, exactly as in the Indicative.

Peculiarities of Sequence.

268. 1. The Perfect Indicative is usually an historical tense (even when
translated in English as a Present Perfect), and so is followed by the
Imperfect and Pluperfect Subjunctive; as,--

demonstravi quare ad causam accederem, _I have shown why I took the
case_ (lit. _I showed why_, etc.).

2. A dependent Perfect Infinitive is treated as an historical tense