假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下作文。文中共有10处语言错误，每句中最多有两处。每处错误仅涉及一个单词的增加、删除或修改。
增加：在却此处加一个漏字符号（∧），并在其下面写出该加的词。
删除：把多余的词用斜线（\）划掉。
修改：在错的词下面画一横线，并在该词下面写出修改后的词。
注意：1.每处错误及其修改均仅限一词；
2.只允许修改10处，多者（从第11处起）不计分。
Dear David,
I have recently felt guilty, stay sleepless at night. You may wonder how. To tell you the truth, it is just because of the fact that I seldom cheat in exams and I just can’t stop me. In many exams, I used cellphones to surf the net for answer. Besides, I sometimes referred them to my notebooks so copied something. As you know, cheating do much harm to our learning and self-confidence. It’s time that I take action to stop it. I would appreciate it you could offer me some advice.
Looking forward to your reply!stay改成 staying
网友回答
(答案→)stay改成 staying
解析：这是作者写给David的求助信，作者经常考试作弊，感觉内疚，但是自己又改不了，所以向David征求建议。
【小题1】stay改成 staying，句意：最近我感觉很内疚，晚上睡不着觉，这里是现在分词做伴随状语。
【小题2】how改成why ，从后面的it is just because of the fact that I seldom cheat in exams，可知是问原因。
【小题3】seldom 改成often，句意：我经常考试作弊。
【小题4】me改成myself，主语是I，宾语应该是myself。
【小题5】answer是可数名词， 改成answers。
【小题6】考查词组；refer to my notebooks参考笔记。
【小题7】so 改成and，有时看笔记抄东西，是并列关系。
【小题8】do改成 does 主语是动名词cheating，谓语是单数。
【小题9】take改成took或前加should，It’s time +从句的句型，从句中用虚拟语气，sb should do或sb did。
【小题10】it后面加if ，句型I would appreciate it if…，如果…我会很感激…。