Students make all sorts of linguistic mistakes , many of which need to be corrected , but it doesn ' t mean that a teacher will have to correct all of them . It ' s impossible and we shouldn ' t do it , either , because it wouldn ' t be polite if I interrupted again and again , and this wouldn ' t help students develop the language intuition and the ability of expressing their ideas in longer paragraphs .
Furthermore , students might be upset if I keep correcting them . In other words , there are some mistakes that teachers don ' t have to correct , for example , those that won ' t cause misunderstanding and some obvious , unintentional mistakes .
On the other hand , teachers must correct those mistakes that cause misunderstanding , and that are systematic errors . Otherwise , the expression or communication would be invalid , or the students would make such mistakes repeatedly .
When I have got to correct mistakes , I ' ll try to do it in more effective ways instead of coldly telling my students " You are wrong ." For instance , when a student finishes talking , I need to understand what he or she was trying to say , and then I ' ll say that myself , as if I were confirming what the student just said . In this case , he or she might notice that we have said differently and he or she might pick up what I have said to correct himself or herself .
Mistakes are not necessarily negative things for at least two reasons . First , as a matter of fact , they will make us reflect our teaching to see if there is room for us to improve our teaching . Second , they can also benefit our linguistic researches . We can analyse those mistakes and find ways to get rid of them . Such researches will benefit the teaching and learning in return .