we can start a conversation between shopkeepers and customers，and we can also start the conversation between the customers．Then what is the objective of the conversation？What kind of language form can be used in the language context？It requires that the teachers must give some clear or definite explanation to the students．Only when the students know what kind of roles they will play and what the objective of the talking is，they can avoid mechanical memorization and be able to start a free conversation in the language context．
D．The language context must be helpful in developing the students'creativity
In the process of English teaching，teachers should not remain satisfied with the memorization of the language，but should extend the development of language skills through language study and proceed from the manipulated practice to the communicative use of the language．After the students have learned some language points in a dialogue，they may be asked to create a new dialogue by giving them some new ideas and lines，which could，of course be in conformity with the original dialogue．
Bibliography．
Halliday，M．A．K．Towards a Sociological Sementics．In Brumfit＆Jahnson（ed），1979．
H．G．Widdowson．1978，From Teaching Language as Communication，Oxford University Press．
Hymes．D．H．On Communicative Competence，University of Pennsylvania Press，1971．
J．F．Wallwork．1968，An Introduction to the Study of Language，London：Longman．
Rivers．W．M．＆Temperley．M．S．A Practical Guide to Teaching English as a Second Foreign Language，Oxford University Press，1978．
Tom M．c．Arthur．A Foundation Course for Language Teachers，Cambridge University Press．
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