参考答案：

解析：This has some implications for attitudes to errors. Since both appropracy and accuracy are important in language use, we should pay the same attention to these two aspects. If one’s language production is appropriate, but dotted with a lot of grammar errors, communication would be affected.On the other hand, if one’ s language production is correct in grammar, but not appropriate in use, communication would not be as effective as expected. Therefore, we should be tolerant to the students’ errors which do not affect communication, and be strict to those which interfere with communication and cause ill effects or ill feeling to the other communicators.