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短文。短文中共有10处错误，每句中最多有两处。错误涉及一个单词的增加、删除或修改。
增加：在缺词处加一个漏字符号(∧), 并在此符号下面写出该加的词。
删除：把多余的词用斜线（＼）划掉。
修改： 在错的词下划一横线, 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。
I often go to a weekend school. So did many of my classmates. This seems popular among students. Good weekend schools have excellent teachers which help us improve our studies. Besides, we get to know students from another schools and learn about their campus of life.
So every coin has two sides. Our school work is already a heavy burden. Extra lesson often take up too much of our time. In addition, pay lots of attention to the extra lessons will affect their school subjects. We may also find ourselves very tired on Mondays to concentrate on the lessons in our own school.. We should think seriously about this issue and make best use of our time. did改为do
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(答案→)did改为do
解析：
【小题1】表示经常或反复发生的动作，用一般现在时，所以did改为do。
【小题2】这里含有一个定语从句，关系词在从句中作主语，指人，故用who或that。
【小题3】表示其他的，用other。
【小题4】校园生活，直接说campus life。
【小题5】这里是转折关系，所以so改为but。
【小题6】表示其他的课程，用复数形式。
【小题7】作主语，故用动名词。
【小题8】表示我们学校的课程，所以their改为our。
【小题9】too…to句型，太……以至于不能。
【小题10】make the best use of是固定短语，意思是充分利用。