How much impact can grammatical system have on the semantic evolution of grams (a case study on the Tas Selkup system of evidential markers).

This paper is devoted to an aspect of the semantic evolution of grams, which seems to be usually underestimated in grammaticalization studies. It is stated that a grammatical system can have a considerable impact on the process. This issue is examined on the example of a Tas Selkup evidential marker, which has developed a wide range of various semantic functions meeting the reqiurements of Selkup verbal system.