汤姆因在学校使用手机被学校处分，他感到很困惑，写信给你求助。请根据以下结构提示给汤姆回信。开头结尾已给出。所给要点必须写到外，自己可以适当补充相关细节。
1: 手机的优点：联系方便（方便convenient），好玩
2: 带手机上学存在的问题：影响教学，花大量时间打手机有害学习和健康
3..词数：100左右。
Your letter reached me yesterday. You said in your letter that
It is right for school to prevent you from using cellphones in school. Your letter reached me yesterday. You said in your letter that you were punished for using cellphones, which puzzled you.
网友回答
(答案→)Your letter reached me yesterday. You said in your letter that you were punished for using cellphones, which puzzled you.
解析：考查应用文中的书信的写作。关于汤姆因在学校使用手机被学校处分的情况，要求给汤姆写回信，同时要点都已经给出，也属于提纲类作文，审题时注意本文使用一般现在时，描述要点时以汉语为依据，运用合适的语法规则和词汇把各要点都准确表述出。难点在于选择词汇和句型，可以灵活运用省略句，倒装句和强调句型准确表述。There is no doubt that cellphones can bring us much convenience.和It has been proved that often using cellphones does harm to health.都用了固定句型。