Deutsche Gebärdensprache
Many sign languages have developed verb agreement with person. The ASL verb for "see" (V handshape), moves from the subject to the object. In the case of a third person subject, it goes from a location indexed to the subject to the object, and vice versa. Also, in German Sign Language not all verbs are capable of subject/object verb agreement, so a dummy verb is used to convey this, carrying the meaning of the previous verb while still inflicting for person.