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934. With regard to the use or non-use

With regard to the use or non-use of the auxiliary vowel i before the sibilant, there is a degree of general accordance between this tense and the other future and the desiderative; but it is by no means absolute, nor are any definite rules to be laid down with regard to it (and so much the less, because of the infrequency of the two latter formations in actual use): between this and the aorist (saorist on the one side, or iṣ-aorist on the other), any correspondence is still less traceable. Practically, it is necessary to learn, as a matter of usage, how any given root makes these various parts of its conjugational system.