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l Matters.
[3]Biber,D.,Johansson,S.,Leech,G.,Conrad,S.&Finegan,E.(1999).Longman Grammer of Spoken and Written English[M].London:Longman.
[4]Coates,J.(1983).The Semantic of the Modal Auxiliaries[M].London:CroomHelm.
[5]Cook,W.(1978).Semantic Structure of English Modals[M].TESOL Quarterly,12, 5-16.
[6]Ehrman,M.(1966).The meanings of the modals in present-day American English [M].Mouton:The Hague.
[7]Ellis,R.(1994).The study of second Language Acquisition[M].Oxford:Oxford University Press

Abstract 3-4
摘要 5-7
Tables 7-8
Abbreviations 8-11
1. Introduction 11-15
    1.1 Significance of the Study 11-12
    1.2 Purpose of the Study 12
    1.3 Innovation of this Study 12-13
    1.4 Structure of the Thesis 13-15
2 Literature Review 15-31
    2.1 Corpus 15-20
        2.1.1 The Definition of Corpus and Corpus Linguistics 15-16
        2.1.2 The History of Corpus Linguistics 16-17
        2.1.3 Classification of Corpora 17
        2.1.4 The Aspects of the Corpus Researches 17-18
        2.1.5 The Characteristics of Corpus Approach 18-20
    2.2 Modal Verbs 20-27
        2.2.1 The Definition of Modality and Modal Verbs 20-22
        2.2.2 The Characteristics of Modal Verbs 22
        2.2.3 The Semantic Classification of Modal Verbs 22-25
        2.2.4 The Grammatical Description of Modal Verbs 25-27
    2.3 Previous Studies 27-29
    2.4 Summary 29-31
3. Research Design 31-35
    3.1 Research Subjects 31
    3.2 Research Questions 31
    3.3 Corpora and Instruments Used in the Present Study 31-33
        3.3.1 The Learner Corpus 31-32
        3.3.2 The Reference Corpus 32
        3.3.3 Instrument Used in this Study 32-33
    3.4 Research Procedures 33-35
4. Results and Discussion 35-63
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