As a teacher you have a great deal of power and influence over the student body, and you should use this to help improve the quality of student writing.
The understanding that writing is not solely the responsibility or preserve of the English department is crucial here. There are many ways that all teachers can improve student writing each lesson. Prioritizing written skills allows students to achieve success, particularly important for senior students, many of whom will have to explain their ideas in writing to pass their end of year exams in order to achieve a score high enough to get into the course they want. Creating students who are effective written communicators is vital for their futures and the futures of the country. If we all place focus on these skills, we can improve their prospects.
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