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emic modality  and  evidential modality. The latter can be of deontic modality and dynamic modality. 
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2.2 Studies on Formal Concept Analysis 
The theory and approach of Formal Concept Analysis (FCA) is used in this thesis. It based on mathematics is put forward by Wille in 1982 (Ganter & Wille, 1999). With the help  of  formal concept  methods,  concept  will  be  presented  visually.  In  the  phrase  of concept formation, it is semiautomatic relying on human participation to identify objects and attributes. It is conducive to extract rules and mine data in many regards.  Mao,  Li  and  Lin (2010) introduce FCA as  a data mining method in remote sensing image  classification.  Fang  City  of  Hubei  province  is  chose  as  the  study  object  and  it concludes that FCA is more adept at digging assortment rules. Liu, Hong, Zhang, Fan and Song  (2010)  bring  in  a  visualization  method  for  differential  diagnosis  in  traditional Chinese  medicine.  The  work  constructs  a  Formal  Context  with  symptoms  as  its  objects and  symptom  elements  as  its  attributes.  Relationships  between  symptoms  and  symptom elements  and  symptoms  themselves  are  clearly  shown.  The  experiment  suggests  that  in computer-aided  study  of  traditional  Chinese  medicine  FCA  is  promising  for  diagnosing diseases.  Obitko,  Vrba,  Kadera  and  Jirkovsky  (2011)  make  a  research  on  industrial  control system  with  regard  to  ontology.  They  devote  to  discovering  knowledge  from  a  concept lattice.  The  concept  lattice  born  of  formal  concept  is  of  great  use  in  all  apects  study  of ontology. Liu, Gao and Hu (2012) demonstrate the application of FCA in Information Science with  the  development  of  semantic  web.  Papers  from  1989  to  2008  of Wuhan  University information research center are selected as data source. Thesaurus of Information Science and Chinese Classification-Subjection Words List are supplemented as key words to build domain ontology in Information Science. The results demonstrate that in the future more attentions should be concentrated on the combination of FCA and construction of domain ontology.  
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Chapter 3 Methodology and Data Collection ......... 17 
3.1 Research procedures ....... 17 
3.2 Data collection ........ 18 
3.3 Research methods ........... 21 
3.4 Tools used in this study ........... 24 
3.4.1 Attribute partial-ordered structure diagram generating tool ......... 24 
3.4.2 Concordance for windows version 2.0 .......... 25 
Chapter 4 Word Sense Classification of English Modal Verb Must...... 27 
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