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herefore,  the  general  distribution  of  lexical  cohesive  devices  and  errors  in  the  use  of them in English majors’ writings need to be explored, and the reasons of errors remain to be studied and analyzed. 
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1.2   Research Objectives and Research Questions 
Lexical  cohesion  is  defined  as  “the  cohesive  effect  achieved  by  the  selection  of vocabulary”  (Halliday  &  Hasan,  2001:  274).  Halliday  &  Hasan  (2001)  make  a  survey  that lexical  cohesive  devices  account  for  about  fifty  percent  in  various  discourse  patterns,  which can be seen patently that lexical cohesion plays a prominent role in English writing. Therefore, the  objectives  of  the  study  are  to  explore  the  characteristics  of  lexical  cohesive  devices  in English majors’ writings, to analyze the types of errors in the use of lexical cohesive devices in  writings  and  to  elaborate  the  reasons  of  errors.  The  study  contributes  to  strengthening students’  awareness  of  using  lexical  cohesive  devices  and  instructing  students  how  to  use them more effectively. To make sure the academic rigour, the subjects of the study are thirty samples  of  college  English  majors  from  Written  English  Corpus  of  Chinese  Learners (SWECCL 2.0).  The present study attempts to probe into the following questions: 1.  What  are  the  general  distribution  of  lexical  cohesive  devices  in  English  majors’ argumentative writings?  2.  What  are  the  types  and  frequency  of  errors  in  the  use  of  lexical  cohesive  devices  in English majors’ argumentative writings? 3. What are the reasons of the errors in the use of lexical cohesive devices? 
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Chapter Two   Literature Review 

This  chapter  will  deal  with  the  theoretical  framework  for  the  present  study  and  make  a general  review  of  previous  empirical  studies  abroad  and  at  home.  As  for  the  theoretical framework in the study, the author will introduce the concepts of key terms, the relationships between cohesion and coherence, the taxonomy of lexical cohesion, as well as error analysis theory.

2.1   Cohesion and Coherence 
Before  making  a  explicit  definition  of  cohesion,  Halliday  &  Hasan  (2001:  1)  make  an overall  interpretation  of  some  key  terms:  text,  texture  and  tie  and  differentiate  them  in  the book, Cohesion in English. Halliday & Hasan (2001: 1) put forth th本论文由英语论文网提供整理，提供论文代写，英语论文代写，代写论文，代写英语论文，代写留学生论文，代写英文论文，留学生论文代写相关核心关键词搜索。