One of the most interesting things to know about this topic are the definitions of some very essential terminology. An error constitutes a mistake which the student cannot self-correct, but may be possible for other students in the same class to correct. Sometimes this is true; sometimes not. I suppose that this comes with experience and knowledge of the CEFR levels . Often our students make slips; especially the higher levels like intermediate and upper-intermediate. Even advanced students can make them. A slip is a mistake that the student can correct on their own ( without any additional instruction). The last are attempts. Attempts are mistakes that every learner of English (or any language for that matter) will make at some point. They may not be familiar with the correct grammar, lexis, etc. However, so long as the mistakes don't detract from understanding the meaning of what the student is saying, these are called local mistakes and may be corrected at the...
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