包邮地道英语写作教程:下册

part ⅲ  practical writing
unit ten  letter writing
  10.1  general introduction
    10.1.1  the format of a letter
    10.1.2  the elementary parts of a letter
    10.1.3  the optional parts of a business letter
    10.1.4  the layout of envelope
  10.2  personal letters
    10.2.1  letter of invitation
    10.2.2  letter of thanks
    10.2.3  letter of consolation
    10.2.4  letter of congratulation
    10.2.5  letter of complaint
    10.2.6  letter of apology
  10.3  business letters