序 前言 Acknowledgements 摘要 Abstract List of Tables List of Figures Chapter 1 Introduction 1.1 Context of the Study 1.2 Purpose of the Study and Research Questions 1.3 Significance of the Study Chapter 2 Theoretical Frameworks in L2 Writing Research 2.1 Theoretical Frame works in L2 Writing Research 2.1.1 Models of Writing 2.1.2 Cummins' Hyootheses of Language Transfer 2.1.3 Conceptions of Second Language Proficiency and Writing Expertise 2.1.4 Working Memory Capacity in Writing 2.2 Review of Relevant Studies 2.2.1 Research on L1 and L2 Writing Ability and L2 Language Proficiency 2.2.2 Research on the Use of Writing Strategies and L2 Writing 2.2.3 Research on Worlang Memory Capacity and Writing 2.3 Summary Chapter 3 Methodologies and Materials 3.1 Participants 3.2 Instruments 3.2.1 Timed Essay Writing in L1 and L2 3.2.2 Writing Strategies Questionnaire 3.2.3 Operation Span Task for Working Memory Capacity 3.2.4 Vocabulary Size Tests 3.2.5 Timed Grammaticality Judgment Task 3.3 Data Collection Procedures 3.4 Scoring 3.4.1 Timed Essay Writing in L1 and L2 3.4.2 Use of Writing Strategies 3.4.3 Working Memory Capacity 3.4.4 Vocabulary Scores 3.4.5 Grammar Score 3.5 Variables for Statistical Analysis 3.5.1 L2 Writing Ability （EW） …… Chapter 4 Statistical Analyses of the Research Questions Chapter 5 Discussion and Conclusion
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