本书是关于研究“二语知识模型有效性”的专著，书中以中国学生对英语情态动词的习得为研究对象，对以往研究中提出的几个较有影响的二语知识模型进行了有效性验证，在此基础上提出了一个更加简化且更具解释力的二语知识模型，并改进了使用结构方程进行类似研究的方法。

本书适合从事相关研究工作的人员参考阅读。

二语知识建构的研究对于二语教学及测试具有重要的理论意义和现实意义。本书以中国学生对英语情态动词的习得为研究对象，对以往研究中提出的几个较有影响的二语知识模型进行了有效性验证，在此基础上提出了一个更加简化且更具解释力的二语知识模型，并改进了使用结构方程进行类似研究的方法。本书除对二语知识模型的有效性验证，还研究了英语情态动词习得过程中的一些重要问题，适合对二语习得规律、英语教学及结构方程在语言学中应用方法等感兴趣的教师和学生阅读。

Chapter 1 Introduction

 1．1 Introduction

 1．2 Rationale for the Book

 1．3 Purpose of the Book，

 1．4 Overview of the Book

Chapter 2 Li terature Review

 2．1 Introduction

 2．2 Competing Views in the Early Stage

 2．3 Canale and Swain’S Communicative Competence

 2．4 Bachman and Palmer’S Model

 2．5 Larsen—Freeman’S Model

 2．6 Purpura’S Model

 2．7 Remaining Problems

 2．8 Research on Modality

 2．9 L2 Acquisition Research of English Modal Verbs

 2．10 Research Questions

 2．11 Definitions of Key Terms

 2．12 Summary

Chapter 3 Research Methodo logy

 3．1 Participants

 3．2 Instruments and Test Design

 3．3 Data Preparation and Collection Procedures

 3．4 Data Analysis Procedures

 3．5 Comparison of the Models

 3．6 SimilaritieS and Differences Between EFA and CFA

 3．7 Empirical Validation of the Research Findings

 3．8 Summary

Chapter 4 Preliminary Statistics and Analyses

4．1 Preliminary Descriptive Analysis of the Tests

4．2 Two Regression Analyses，

4．3 Preliminary Analysis for Model Validation

4．4 Summary

Chapter 5 Confi rrnatory Factor Analysis of L2 Knowledge Models

 5．1 Preliminaries for the Construct Validation of the Modal Verbs Test

 5．2 Confirmatory Factor Analyses of the Four L2 Knowledge Models

 5．3 Comparison of Knowledge Models of L2 Acquisition

 5．4 Discussion on Research Questions 2～6

 5．5 Summary

Chapter 6 An Integrated Mode I of L2 Knowledge

 6．1 Examination of an Integrated Model of L2 Knowledge

 6．2 Validation of the Integrated Model Through Learners'Mental Representation

 6．3 Summary

Chapter 7 A Case Study

 7．1 Examination of the Difficulty Order in the Acquisition of English Modals with Regard to Meaning

 7．2 Examination of the Difficulty Order of English Modals with Regard to Pragmatic Use

 7．3 Summary

Chapter 8 Summary and ConcIusions

 8．1 Major Findings

 8．2 Significance of the Book

 8．3 Limitations of the Book

 8．4 Recommendations for Further Research

Appendix A General Grammar Test

Appendix B English Modal Verbs Test

Appendix C Questionnaire on L2 Knowledge

Appendix D Free Sentence Production(A Sample)

kppendix E Raw Data(A Sample)

Bibliography

Acknowledgments