 However, there is an obvious problem with the idea that we can assign a content, in this sense, to all of the expressions of a language like English: many expressions, like “I” or “here”, have a different reference when uttered by different speakers in different situations. So we plainly cannot assign to “I” a single content which determines a reference for the expression, since the expression has a different reference in different situations. These “situations” are typically called contexts of utterance, or just contexts, and expressions whose reference depends on the context are called  indexicals (see entry)  or context-dependent expressions.