LM-M indicates that some of the typological peculiarities of the word chord in sign language can be explained by a look at its diachronous origins. I would like to follow this path and trace the diachronic evolution of the verbal agreement in the sign language of Israel (ISL). As soon as we understand how such a system has evolved, we will be able to explain why it is transmission verbs that reach an agreement and why this specific model of agreement is ubiquitous in sign languages and limited to sign languages. Some sign languages (but not ASL) use an auxiliary sign to display the marking of people with simple verbs. The authors described similar signs in a large number of sign languages (see Steinbach and Pfau 2007 for a summary), but they used different labels and proposed various analyses for these signs, including AUX (aids; Smith 1990 for Taiwan Sign Language; Fischer 1996 for JSL; Quadros 1999 for Libras, ACT-ON (Bos 1994 for SLN) and PAM (markers of the people agreement); Rathmann 2000 for German sign language). What these different signs have in common is that they move like verbs of orientation from the place of a subject to the place of an object. In some sign languages, they are only displayed with simple verbs; in others, they can occur with orientation verbs. Both signs from American Sign Language (ASL) describe a person asking another person. The difference lies in the question of which of the two people asks the other.
In the absence of a previous context, the first sign means that I asked someone, while the second sign means that someone asked me. They differ only in the direction and direction of the movement; In the first example, the hand is oriented and moves away from the body of the signatory, and in the other it is oriented and moves in the opposite direction, towards the body. Such changes in the direction and direction of the movement are related to the change of direction described above. The phenomenon has several characteristics in almost all sign languages documented to date, which distinguish it from the verbal agreement in spoken languages. It has long been found that not all verbs show direction, and of those that show it, not all show it in the same way. Some verbs move in relation to positions related to people`s arguments (in general, they are simply called chord verbs); others move in relation to positions such as source and objective (space verbs); and others show no direction (simple verbs). Padden (1983, 1990) and others assumed that the question of whether or not a verb “agreement” could be accepted would be entered into the lexicon (in arbitrary lexical categories). Although many languages have different classes of verbs, based on the form of the chord they adopt (for example, verbs in Spanish. B-ar and -ir), the classification of verbs in sign language is a considerable obstacle to better understanding how the system works.