What is the job of a language function?

The referential function: corresponds to the factor of Context and describes a situation, object or mental state. The descriptive statements of the referential function can consist of both definite descriptions and deictic words, e. g. "The autumn leaves have all fallen now." Similarly, the referential function is associated with an element whose true value is under questioning especially when the truth value is identical in both the real and assumptive universe.