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，每句中最多有两赴，每处错误仅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（八），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限一词。
2．只允许修改10处，多者（从第11处起）不计分。
When I was a child, I spent more than ten years learn the violin．Therefore, I couldn't understand real music．After I graduated at high school, a friend of mine suggested that we started to learn the guitar because we all thought it was cool．l will never forget the day on that we went to buy guitars in the guitar store． There I saw a guitar player playing the guitar, which I really enjoyed．He became my the first guitar teacher．It took me such a long time choose a guitar among several wonderful model．Now the guitar is the most importantly part of my life and I practice it every day.learn → learning
网友回答
(答案→)learn → learning
解析：当我小的时候，我花了十年的时间练习小提琴。但是我不能理解“真正的音乐”。在我高中毕业后， 我的一个朋友建议我们开始学习吉他。并且我们也找到了一个吉他老师，现在吉他成了我生活中重要的一部分，我对音乐也有了更深的理解。
【小题1】learn → learning 。I spent more than ten years learn the violin 固定短语：spend time/ money doing sth “花钱或时间做某事”，所以把learn改为learning。
【小题2】Therefore → However。Therefore, I couldn't understand real music．根据上下文内容可知此处前后句是转折关系，所以把Therefore 改为However。
【小题3】at → from。．After I graduated at high school, 固定短语：graduate from “从……毕业”，故把介词at改为from。
【小题4】started → start 。a friend of mine suggested that we started to learn the guitar。suggest 当“建议”讲时，后面宾语从句的谓语动词应该用“should +v原形”，所以把started改为start。
【小题5】all → both。a friend of mine suggested that we started to learn the guitar because we all thought it was cool．根据前面主句可知此处指朋友和作者两个人，所以把all改为both。
【小题6】that →which 。l will never forget the day on that we went to buy guitars。从结构可知the day后是介词+which/whom引导的定语从句，此处指代day所以用which，答案把that改为which。
【小题7】去掉my 或the。He became my the first guitar teacher．物主代词和定冠词均属于前位限定词，不能同时出现，故去掉my或者the。
【小题8】choose前加 to。It took me such a long time choose a guitar among several wonderful model．固定句型：it takes sb some time to do sth“做某事花费某人多长时间”，所以choose前加to。
【小题9】model → models 。 It took me such a long time choose a guitar among several wonderful model。several 修饰复数名词，把model改为models。
【小题10】importantly → important。Now the guitar is the most importantly part of my life and I practice it every day. 修饰名词part应该用形容词，故把importantly改为important。