 The simple Fregean solution, however, faces other, more serious, problems. First, the account seems to fail when we try to extend it to other types of attitude reporting sentences than the classical examples we have considered above. One of our most common ways of referring to individuals is to use indexicals and demonstratives, such as ‘I’, ‘you’, ‘this’, ‘she’, and ‘they’. It is difficult to accommodate the use of such terms with a Fregean theory that requires that the mode of presentation is the semantic value of a singular term in a propositional attitude clause. (See Perry 1977, 1979 and Kaplan 1977, pp. 529–36 for a development of the problem of indexicals and demonstratives. See Evans 1985 for an attempt to solve the problems indexicals pose for a Fregean solution to Frege’s puzzle. For more recent attempts, see Heck 2002.)