551. Below are given, for convenience, in tabular form, the schemes of endings as accepted in the classical or later language: namely, a. the regular primary endings, used in the present indicative and the future (and the subjunctive in part); and b. the regular secondary endings, used in the imperfect, the conditional, the aorist, the optative (and the subjunctive in part); and further, of special schemes, c. the perfect endings (chiefly primary, especially in the middle); and d. the imperative endings (chiefly secondary). To the so-called imperative endings of the first person is prefixed the ā which is practically a part of them, though really containing the mode-sign of the subjunctive from which they are derived.
552. Further, a part of the endings are marked with an accent, and a part are left unaccented. The latter are those which never, under any circumstances, receive the accent; the former are accented in considerable classes of verbs, though by no means in all. It will be noticed that, in general, the unaccented endings are those of the singular active; but the 2d sing.has an accented ending; and, on the other hand, the whole series of 1st persons imperative, active and middle, have unaccented endings (this being a characteristic of the subjunctive formation which they represent).
553. The schemes of normal endings, then, are as follows:
|a. Primary Endings.|
|3||ti||tás||ánti, áti||té||ā́te||ánte, áte|
|b. Secondary Endings.|
|3||t||tā́m||án, ús||tá||ā́tām||ánta, áta, rán|
|c. Perfect Endings.|
|d. Imperative Endings.|
|2||dhí, hí, —||tám||tá||svá||ā́thām||dhvám|
|3||tu||tā́m||ántu, átu||tā́m||ā́tām||ántām, átām|
554. In general, the rule is followed that an accented ending, if dissyllabic, is accented on its first syllable — and the constant union-vowels are regarded, in this respect, as integral parts of the endings. But the