 Indexical  To determine the reference of an indexical expression (that is, to determine what a speaker is referring to by the utterance of an indexical expression), the interpreter must resort to context. This is the most prominent property of indexical expressions: without varying their meaning, they can change their content from context to context. Paradigmatic indexical expressions are personal pronouns (‘I,’ ‘you,’ ‘she’…), demonstratives (‘this,’ ‘that’), time and place adverbs (‘here,’ ‘there,’ ‘now,’ ‘yesterday,’ ‘tomorrow’…). But indexicality is a more general phenomenon: verb tense and aspect point to context for determining the relevant temporal point or interval. The semantic information of some indexical expression leaves little room for doubts about what to look for in context: ‘I’ refers to the speaker, ‘here’ refers to the place the speaker is in, ‘tomorrow’ to the day starting at midnight of the day of utterance. These are called ‘pure’ or ‘automatic’ indexicals, in contrast to ‘discretionary’ indexicals, whose semantic information does not determine the referent, and it is necessary to appeal to speaker’s intentions to do so (Perry 2001). Indexical expressions have been called ‘deictic,’ ‘egocentric particulars’ and ‘token-reflexive expressions.’