| Based on some theoretical researches on error analysis and learners'interlanguage, this thesis aims to explore the errors and the causes of the errors in the senior middle school students' English writings.First, the thesis investigates the errors made by the students of Jiangxia Experimental Senior Middle School in their compositions. Then, an analysis of those errors is made following the procedures of identifying, describing, clarifying, explaining and evaluating the errors. After that, a questionnaire is designed to make a survey of the causes of the errors for the purpose of improving English teaching. Some proper ways are suggested to both the teachers and the students in senior middle schools, particularly the ways for the teachers to encourage idiomatic use of English for the students.According to the investigation and the analysis of the errors, it is true that learners will make different errors in their different training stages. Senior middle school students usually make some errors in their writings in spellings, dictions, sentence structures and some grammatical meanings of the text such as some oral words in written language and incohesive sentences and so on. The causes of the errors are different, ranging from the interference of the first language; the ignorance of the target language's rules, the overgeneralization of those rules, the learners' learning and communicating strategies and even the teachers' training ways for their students.In order to reduce the students' errors and develop their own interlanguage, senior middle school English teachers should first of all treat the errors properly and then use some correct ways to teach English, especially to cultivate a fine linguistic sense of English for the students. Besides, the teachers should try hard to improve students' abilities of listening,reading,speaking and writing , making them capable of getting English information, processing it and solving the related problems. |