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.
Our (my) letter; Our (my) respects; Ours (mine); This letter; these lines; The present.
The last letter; The last mail; The last post; the last communication; The last respects（自己的信）; The last favour（来信）
The next letter; The next mail; The next communication; The letter following; the following.
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.
Your telegram; Your wire; Your cablegram（从国外）; Your coded wire（密码电报）; Your code message; Your cipher telegram; Your wireless telegram; Your TELEX; Your Fax.
Your telephone message; Your phone message; Your telephonic communication; Your telephone call; Your ring.
Advice; Notice; Information; Notification; Communication; A report; News; Intelligence; Message.
To communicate (a fact) to; To report (a fact) to...on; To apprise (a person) of; To let (a person) know; To acquaint (a person) with; To intimate (a fact) to; To send word; to send a message; To mail a notice; to write (a person) information; To give notice（预告）; To break a news to（通知坏消息）; To announce（宣布）.
An answer; A reply; A response.
To answer; To reply; To give a reply; To give one's answer; To make an answer; To send an answer; To write in reply; To answer one's letter.
Reply to; Answering to; In answer to; In reply to; In response to.
To await an answer; To wait for an answer.
To get an answer; To favour one with an answer; To get a letter answered.
Receipt（收到）; A receipt（收据）; A receiver（领取人，取款人）; A recipient（收款人）
To receive; To be in receipt of; To be to (at) hand; To come to hand; To be in possesion of; To be favoured with; To get; To have; To have before (a person); To make out a receipt（开出收据）; To acknowledge receipt（告知收讫）.
To confirm; Confirming; Confirmation; In Confirmation of（为确认...,为证实...）; A letter of confirmation（确认函或确认书）