问题：
总结partI 16个句子中,partII 三段情景对话和partIII note中所出现的主要句型
答案：
would like to do sth or so want/have/make sth done need sb/sth to do sth forget to do sth have to do sth one more thing had better do sth by ordinary/registered mail rely on sb/sth has been delivered 现在完成时被动语态 will be sent/informed 一般将来时被动语态 are conduced 一般现在时被动语态 to be sent abroad 不定时被动语态 should be used 情态动词被动语态