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chapter 1 introduction 1.1 research background 1.2 key terms 1.3 research questions 1.4 the structure of the book 1.5 the research significance 1.6 background of the researcherchapter 2 literature review 2.1 language as discourse   2.1.1 the acquisition metaphor and participation metaphor   2.1.2 defining discourse 2.2 identity in applied linguistics   2.2.1 reflective discourse approach based researches   2.2.2 interactional discourse approach based researches 2.3 summarychapter 3 methodology 3.1 qualitative research   3.1.1 reflective discourse approaches   3.1.2 international discourse approaches 3.2 procedures   3.2.1 research design   3.2.2 the participants' portraits   3.2.3 data collection   3.2.4 data analysis 3.3 researcher bias and ethical considerations 3.4 conclusionchapter4 reflecting on identity 4.1 reflecting on different identities in l1 and 1_2 contexts   4.1.1 ordinary person versus "disabled" identity   4.1.2 professional identity versus incompetent l2 identity   4.1.3 university student identity versus foreign student identity    4.1.4 excellent student identity versus inferior l2 user identity   4.1.5 successful l2 user identity versus english speaker identity  4.2 struggling in becoming ordinary in both l1 and l2 contexts   4.2.1 self-oriented to l2 user identity   4.2.2 transposition in various language-related communities   4.2.3 second language interaction associated with emotion fluctuation   4.2.4 conflict as an impetus to identity construction   4.2.5 individual's philosophy 4.3 conclusion: from group identity to individual identitychapter 5 identity in interaction 5.1 doing difference: ascribing an l2 learner identity   5.1.1 ascribing l2 learner identity through sipping   5.1.2 ascribing l2 identity through gaze shifting 5.2 doing sameness: accomplishing affiliation in interaction   5.2.1 affiliation accomplished through doing being different from a third party   5.2.2 affiliation accomplished through doing being an l2 learner 5.3 conclusion :chapter 6 discussion and conclusion 6.1 summary of the study 6.2 theoretical and pedagogical implications 6.3 conclusion: beyond the labelsreferencesappendices appendix 1 : convention transcription appendix 2: consent to participate in research appendix 3: language use consent form