有时，运用被动语气，比主动语气客气，如： a) You made a very careless mistake. A very careless mistake was made b) You did not enclose the check with your order. The check was not enclosed with your order. c) For the past two years, you did not give us any order. For the past two years, no order has been given us. Or: For the past two years, no business has been materialized between us.
a) we demand immediate payment from you demand的意思是ask for(sth) as if ordering, or as if one has a right to, 即带有命令意味的要求。非不得已，应尽可能避免使用demand而改用request 如： We request your immediate payment.
b) We are disgusted with your manner of doing business. disgust意味hate而且有strong feeling of dislike or distasted, 既"厌恶"的意思， 因此，还是婉转或含蓄一些为宜，如： We are not completely satisfied with your manner of doing business.
c) We must refuse your offer. Must………带有威胁性的意味（minatory tone），不如改为： We regret that we are unable to accept your offer. Or: We regret that we are not in a position to accept your offer.
d) We want you to assist us 带有傲慢或长者的口吻（superior tone），不如改为： Your assistance would be appreciated.
(1) We have pleasure of -ing……. We have pleasure in -ing……. It is with pleasure that we do so It gives us(great, much) pleasure to do so We are pleased for us to do so It＇s a pleasure for us to do so. We are glad(or: delighted) that you do so We shall gladly do so We shall feel happy if you will do so We are happy to do so
(2) 表示感谢的表达法有： We are (very, most) appreciative of your doing so We are gratified to learn that you do so We shall be (or: feel) obliged by your doing so We shall be obliged if you will do so You will oblige us by doing so We shall be grateful to you if you will do so We shall appreciate your doing so We shall appreciate it if you will do so We shall thank you to do so It will be appreciated if……. We are thankful that you do so
(3) 表示遗憾的表达法有： It is a matter for regret that we cannot do so It is with regret that we must do so We express our regret at -ing….. To our regret we cannot do so It is regrettable that we must do so We regret that we cannot do so We regret to do so It is to be regretted that you do so We are regretful that we must do so It is a pity that you cannot do so We are sorry we cannot do so We are sorry to do so 注：以上的表达法只是常用的一部分。
（1） 不要使用已经过时的毫无意义的老套子，如： our esteemed clients; your esteemed letter; your respectable house; your good self(or good selves); your valued order; your esteemed reply等等
（2） 要分清"礼貌"与"卑恭"的界限，如： (a) We are extremely and sincerely sorry for the error and ask that you accept our humble and sincere apology for the undue inconvenience suffered by you. b) We beg to acknowledge receipt of your letter dated 11th December. b) We beg to enclose herewith our invoice.
a) We are concerned about the inconvenience you have suffered, and apologize sincerely.
b) We have received your letter on Dec.
c) we enclose (herewith) our Invoice. Or: We are pleased to enclose our invoice