一、 书信作文：书信格式：（一）称呼1、写给机构：Dear Sir or Madam, 2、写给个人：Dear + 人名, （二）正文：3段，10句，120-150词，3-5个关联词，3-5个从句 1、第一段：2句1）自我介绍（私人书信除外）：I am a freshman/sophomore/junior/senior/undergraduate/graduate from the Department of Chinese Language and Literature of Beijing University. 2）写作目的：I am writing the letter in purpose of .I am writing to inform you that I wish to .（1） 建议信：give/offer/render useful/practical/conducive suggestions/proposals/recommendations （2） 投诉信：express/air
