Writing the business letters in English is very much like writing letters in your own language. The letter reflects the image of your firm. You should keep in mind that a letter should be clear, complete, concise, courteous and correct meaning that the letter should be polite, clear, brief, ended and without mistakes. British usage is far more polite than Russian:
Please let us know your terms...
We are pleased to inform you that...
When you are writing a letter, it is often a good idea to make a list of the things you want to say, and to make sure that they are in right order.
There are numerous types of business letters.
The most often used are: Inquires; Replies to Inquires; Offers anc Quotations; Sales letters; Orders; Packing Instructions; Order Confirmations; Order Acknowledgements; Complaints- and Claims, etc.
In addition there are letters of a semi - private nature:
Letters of Application; Testimonials; Congratulations; Condolences; Invitations; Hotel and Travel bookings; 'Thank you' Letters, etc.