İngilizce'yi anadil ve yabancı dil olarak konuşan yazarların doktora tezlerindeki kanıtsallık kullanımının çözümlemesi

Different genres both vary with one another in the use of reliable knowledge as content and show a variety of tendencies in speaker/writer commitment to the validity of the proposition. A piece of rumor and a report based on a scientific observation, for example, consist of neither knowledge with an equally high degree of reliability nor an equally high degree of speaker/writer commitment. Genres differ in terms of the choice of formal vs. informal lexical items, the use of tense, aspect and temporal reference, evidential and epistemic markers. In this study, evidentiality is investigated in its broadest sense (Chafe, 1986) in the present study. Chafe's taxonomy (1986) revised by taking Ifantidou's (2001) suggestions has been applied to three different groups of datasets, including one group of native speakers of English and two groups of non-native speakers; those who have Turkish L1 and other languages as L1 backgrounds. These three groups of data sets are examined to investigate whether the native language of the learner would make any differences in the choice of evidential markers. The results show that the native speakers of English use evidential markers more frequently compared to the non-native authors. In addition, regarding the Native Language/Interlanguage comparison in Contrastive Interlanguage Analysis (Granger, 1996, 1998), the overall use of evidentiality reveals that the non-native authors do not show native-like features in the use of evidentiality. As for the Interlanguage/Interlanguage comparison, Turkish authors of academic texts differ in terms of the use of evidentiality from the authors with various native language backgrounds.