LIST OF FIGURES

Figure 2-1 The Notion of the IL

Figure 2-2 The Notion of Dialect Relation

Figure 2-3 The IL Continuum

Figure 3-1 The Mixed Research Methods in This Study

Figure 3-2 Theoretical Framework of EA Cited from Ellis（1994）

Figure 3-3 The Procedure of Conducting the Interview

Figure 4-1 The Frequencies of the Linguistic Errors Made from the Year 2013 to 2020

Figure 4-2 The Changes in Total Error Numbers of Each Year in Terms of Proficiency Levels

Figure 4-3 The Changes in Errors in Terms of Each Category from the Year2013 to 2020

Figure 4-4 The Types and Frequencies of Linguistic Errors

Figure 4-5 Frequencies of Each Type of Errors