1.the top part of a business letter
日期：date: 23 december XX
地址：mr. james green
sales manager
bbb plc
55-60 old st, london e6 6hg
称谓：dear mr. green (dear gentlemen, dear sir, dear sirs, dear madam)
2.the body part of a business letter
标题（可以不要）
正文
3. look at the two endings of business letter below. notice the useful phrases that are used in these..