Other verb forms include causatives, reciprocals, and reflexives. Some Indo-European languages have a different reflexive morpheme for extroverted reflexives. Pronouns and reflexives also have to agree with their antecedent in number and person. The noun heads have plurals, locatives, deictics, ergatives, reflexives and other generally word-final case markings. Within the linguistics literature, reflexives with discourse antecedents are often referred to as logophors. The relationship between these reflexives and the antecedents is logophoric. The matter of indirect reflexives in logophoric contexts in particular, has been much debated. In Chinese, there are two types of long-range third-person reflexives&colon; simplex and complex. The subset of reflexives expresses co-reference of two participants in a sentence. Formally, those forms coincide with reflexives in these languages. Locality domains for reflexives are first determined by the proximity of indexicals, "myself", to v.