Don't ______(boring) your brother .He is busy doing his homework.以适当形式填空,说出为什么,为什么

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• Don't ______(boring) your brother .He is busy doing his homework.以适当形式填空,说出为什么,为什么
• do you forget 和 have you forgotten的区别新概念第三册24课课后练习有这个选择题 ‘ ______ that I was a medical student once upon a time?’ (1.22)a．Why don't you rememberb．Have you forgottenc．Do you forgetd．Have you not remembered但是书上课文中有原文：“You forget that I was a medical student once upon a time.”为什么选B,C为什么是错的?
• Mrs,Smith was very nice when she was young.改为一般疑问句