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604. These classes have in common

These classes have in common, as their most fundamental characteristic, a shift of accent: the tone being now upon the ending, and now upon the root or the class-sign. Along with this goes a variatior in the stem itself, which has a stronger or fuller form when the accent rests upon it, and a weaker or briefer form when the accent is on the ending these: forms are to be distinguished as the strong stem and the weak stem respectively (in part, both have been given above). The classes also form their optative active, their 2d sing. imperative, their 3d pl. middle, and their middle participle, in a different manner from the others.