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lidity  of  CF  has  important  theoretical  and  practical  significance  for foreign  language  teaching  and  research  in  China.  The  theoretical  significance  is  that  the research  on  feedback  involves  many  fields  such  as  SLA,  psycholinguistics  and  cognitive psychology, and it involves many important concepts and mechanisms like language learning mechanism,  cognitive  mechanism  and  the  distinction  between  first  language  and  second language  acquisition.  Furthermore,  CF  is  an  important  part  of  communicative  language teaching method. At present, researchers agree that CF is a critical mean to guide students to pay  attention  to  grammatical  forms  and  improve  learners’  accuracy  in  meaning-oriented English teaching. Although the impact of feedback on SLA has been initially confirmed, but the effectiveness of different types of CF in English classroom still needs further proof. 
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Chapter II literature review 

2.1 Basic Concepts 
This chapter deals with the literature review of this study, some basic concepts relevant to CF will be firstly defined, such as the definition and classification of error, CF and uptake. Secondly, the author puts forward the previous research of CF abroad and at home.All  the  second  language  learners  will  make  errors  in  the  process  of  learning.  Errors  are inevitably  and  it  is  a  normal  phenomenon  in  language  learning.  For  a  long  time,  however, there  is  no  generally  accepted  definition  of  error.  Different  researchers  have  given  different definitions of errors from different perspectives. For example, Corder (1967) defined errors as the  result  of  learners’  lacking  knowledge  of  the  correct  rules  of  language.  Chaudron  (1988) argued  that  errors  are  the  language  form  or  content  deviating  from  the  norms  of  native language, it also includes other forms, which the teacher points out that needs to be improved. Moreover,  according  to  Hu  Zhuanglin  (2002),  errors  are  due  to  the  incorrect  or  incomplete learning,  which  lead  to  learners’  incorrect  using  of  the  language.  Different  scholars  have different definitions of errors. In short, error involves a variety of inappropriate language and pragmatic expression. In  addition,  Corder  (1967)  also  presented  the  distinction  between  the  concepts  of  error and mistake. Error refers to the performance of second language learners that do not meet the norms  of  target  language  due  to  the  lack  of  language  competence. &nbs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。