In the language of the Mocobis the personal signs consist merely in letters, prefixed and suffixed, and have no apparent relationship to the pronouns. By affixing these letters, phonetic changes take place so that the stem is combined with them into one form.
Among the tense signs, a prefixed l indicates a past time, a suffixed o, the future; but the others are independent particles, loosely attached to the stem.
I have already shown how the Mbaya language conjugates adjectives with the independent pronoun, and participles with the possessive pronoun. The signs used in the conjugation proper of the attributive verb, do not appear elsewhere in the tongue, and must have descended from an older period of its existence.
In the tense and mode signs it is easily perceived how descriptive phrases pass into true forms. For the imperfect and pluperfect the speaker can choose among a number of particles, all of which indicate past time. The modes have definite signs, but these are merely appended, and some have separate significations. The future and perfect have not merely fixed particles, but these are worn down to one letter, so that the stem is actually incorporated with them.
2. In the languages heretofore considered the personal signs added to the word make up the conjugation, and the other signs are attached loosely and externally. The reverse of this, though not perfectly so, appears in the Lule language. The tense and mode signs, often of but one letter, are immediately and firmly attached to the stem, and the pronouns are affixed to this to complete the conjugation. These pronouns are, however, the ordinary possessives, so that noun and verb become in a measure identical; thus, camc means both “I eat” and “my food;” cumuee, “I marry” and “my wife;” only in a few examples are the verbal pronouns distinct from the possessives.
In this case, therefore, the personal signs are independent elements, occurring elsewhere in the language, while the tense and mode signs are true affixes.
The inflection-syllables form with the stem real verbal forms, and so far the conjugation of this language belongs to the third case. But each of the elements has its fixed position, and as soon as one has the key to the combination, he can recognize and separate them at once.
Reasons which it would require too much space to set forth render it probable that all the tense signs are really auxiliary verbs or come from them. This is evident of the optative, as has already been shown. The present only is simple, as it has no tense sign.
Slight differences are found between the personal signs of some tenses, so that these tenses can be distinguished by them, a trait usually seen only in tongues so far cultivated that the grammatical forms have undergone such changes as no longer to present simple and uniform combinations. Equally curious is the regular omission of the tense sign of past time in the third person plural only. Although, except in this case and that of the present, each tense has its definite sign, inserted between the stem and the personal sign, yet there are, besides these, various particles expressing past time, which can accompany the usual tense form, so that there is a double sign of time, one in the word itself and one loosely attached to it.
The languages of the Mbayas, Abipones, Mocobis and Lules are closely allied both in words and in some grammatical forms. It is all the more extraordinary, therefore, to find the last-mentioned pursuing a method in the structure of its verb which is almost totally opposed to that in the other three tongues.