1）贵函 Your letter; Your favour; your esteemed letter; Your esteemed favour; Your valued letter; Your valued favour; Your note; Your communication; Your greatly esteemed letter; Your very friendly note; Your friendly advice; Yours. （2）本信，本函 Our (my) letter; Our (my) respects; Ours (mine); This letter; these lines; The present. （3）前函 The last letter; The last mail; The last post; the last communication; The last respects（自己的信）; The last favour（来信） （4）次函 The next letter; The next mail; The next com...