for the names of other people involved (e.g., Sho, Alana, and Ali), all proper nouns. Grammar Pronouns () are listed as one of eight parts of speech in The Art of Grammar, a treatise on Greek grammar attributed to Dionysius Thrax and dating from the 2nd century BC. The pronoun is described there as "a part of speech substitutable for a noun and marked for a person." Pronouns continued to be regarded as a part of speech in Latin grammar (the Latin term being , from which the English name – through Middle French – ultimately derives), and thus in the European tradition generally. Because of the many different syntactic roles that they play, pronouns are less likely to be a single word class in more modern approaches to grammar. Linguistics Linguists in particular have trouble classifying pronouns in a single category, and some do not agree that pronouns substitute nouns or noun categories. Certain types of pronouns are often identical or similar in form to determiners with related meaning; some English examples are given in the table. This observation has led some linguists, such as Paul Postal, to regard pronouns as determiners that have had their following noun or noun phrase deleted. (Such patterning can even be claimed for certain personal pronouns; for example, we and you might be analyzed as determiners in phrases like we Brits and you tennis players.) Other linguists have taken a similar view, uniting pronouns and determiners into a single class, sometimes called "determiner-pronoun", or regarding determiners as a subclass of pronouns or vice versa. The distinction may be considered to be one of subcategorization or valency, rather like the distinction between transitive and intransitive verbs – determiners take a noun phrase complement like transitive verbs do, while pronouns do not. This is consistent with the determiner phrase viewpoint, whereby a determiner, rather than the noun that follows it, is taken to be the head of the phrase. Cross-linguistically, it seems as though pronouns share 3 distinct categories: point of view, person, and number. The breadth of each subcategory however tends to differ among languages. Binding theory and antecedents The use of pronouns often involves anaphora, where the meaning of the pronoun is dependent on another referential element. The referent of the pronoun is often the same as that of a preceding (or sometimes following) noun phrase, called the antecedent of the pronoun. The