改写后的文章如下：
短语 "occur" 常见于以下几种表达中：
当不愉快的事情发生在某人身上时，我们可以说 "happen to sb"，例如："I hope no accident has occurred to him."
表示某事被想起或想到，用 "come to mind of (sb/sth)"，如："Such a simple explanation never occurred to me!"
当某人突然想到一个主意时，可以用 "occur to sb"，如："A wonderful idea occurred to him."
当一个想法或念头出现时，我们可以说 "It occurred to him"，如："As soon as that thought occurred to him, he felt worse."
用 "It ～s/ed+to sb+to-v/that-clause" 表达未曾想到某事，比如："Didn't it occur to you to close the window?"
同样，"occur" 也用于描述某人意识到问题或采取行动，如："It occurred to him to tell the colonel about the problem."
它还可以表示意识到某事的重要性，如："It never occurred to me not to endeavor to do so;">
对于旧物可能的价值，人们有时会想到，如："Has it ever occurred to you that this old book might be of great value?"
在某些情况下，人们会意识到某人可能是在假装，如："It never occurred to me that he was only acting a part."
甚至在记忆中想起某次经历，用 "It occurred to me"，如："I had seen her before somewhere, but I couldn't recall where."
最后，"occur" 也用于描述意识到某事的遗忘，如："It occurred to her that she might have left the door unlocked."
总的来说，"occur" 作为不及物动词，其核心意义是"出现"或"想起"，通常带有意外或突然的意味。它不适用于表达计划内的事情，且不用于被动语态，通常用主动形式表达。