（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 communication; The letter following; the following.

（5）贵函发出日期
Your letter of (the) 5th May; Your favour dated (the) 5th June; Yours of the 3rd July; Yours under date (of) the 5th July; Your letter bearing date 5th July; Your favour of even date(AE); Your letter of yesterday; Your favour of yesterday’s date; Your letter dated yesterday.