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4 Coates, J, "The Semantics of the Modal Auxiliaries" Croom Helm 1983
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8 Biber, D, "Longman Grammar of Spoken and Written English" Pearson Education 1999
9 석데리아순영, "Interlanguage development of young Korean EFL learners’ modal usage: A learner corpus study" 언어정보연구소 35 : 83-103, 2018
10 Römer, U, "How to Use Corpora in Language Teaching" John Benjamins 185-199, 1996
1 윤태진, "학습자 코퍼스를 이용한 서법조동사의 분포의 범언어적 연구" 국제언어인문학회 18 : 137-154, 2016
2 Kennedy, G, "Using Corpora to Explore Linguistic Variation" John Benjamins Publishing Co 74-90, 2002
3 Leech, G, "Towards a Semantic Description of English" Indiana University Press 1969
4 Coates, J, "The Semantics of the Modal Auxiliaries" Croom Helm 1983
5 Blanchard, D, "TOEFL11: A Corpus of Non-native English" Educational Testing Service 2013
6 Lyons, J, "Semantics. Vols. 1 &2" Cambridge University Press 1977
7 R Core Team, "R: A Language and Environment for Statistical Computing"
8 Biber, D, "Longman Grammar of Spoken and Written English" Pearson Education 1999
9 석데리아순영, "Interlanguage development of young Korean EFL learners’ modal usage: A learner corpus study" 언어정보연구소 35 : 83-103, 2018
10 Römer, U, "How to Use Corpora in Language Teaching" John Benjamins 185-199, 1996
11 Aksu-Koç, A, "Evidentiality: The Linguistic Coding of Epistemology" Ablex Publishing 159-167, 1986
12 Kristina T, "Enriching the Knowledge Sources Used in a Maximum Entropy Part-of-speech Tagger" 63-70, 2000
13 Aarts, Bas, "English Syntax and Argumentation" Palgrave Macmillan 2013
14 Georgieva, M, "Current Issues in European Second Language Acquisition Research" Gunter Narr 151-163, 1993
15 Nenadic, O, "Correspondence Analysis in R, with Two- and Three-dimensional Graphics: The ca Package" 20 (20): 2007
16 Quirk, R, "Comprehensive Grammar of the English Language" Harlow 1985
17 Mindt, D, "An Empirical Grammar of the English Verb: Modal Verbs" Cornelsen 1995
18 오선영, "A Corpus-based Study of Epistemic Modalityin Korean College Students’ Writings in English" 한국영어교육학회 62 (62): 147-175, 2007