According to the classic definition, a pronoun is a word used in place of a noun. However, some pronouns work like adjectives, modifying the meaning of a noun. Whether pronouns like this, that and each should be called adjectives when used with nouns is a matter best left to the theoreticians. The Modern English definite article is in origin a demonstrative pronoun, and Old English used a demonstrative where we now use the definite article. This is a relatively large group of pronouns that indicate that we are speaking about one or more members of some category of things but do not specify exactly which.
Modern examples are all, any, anyone, each, few, many, none, one, and something .
A reflexive pronoun is used in the complement of a clause or sentence to refer to the same thing as the subject. Old English commonly uses the accusative or dative of a personal pronoun as a reflexive, or it uses the word self . These pronouns refer individually to the things that make up a plural antecedent and indicate that each of those things is in the position of object of the others as subjects. This rule can produce some disconcerting effects for the modern reader.