【正文】 practice might be coded or recognized as stereotypically masculine or feminine and thus certain types of linguistic activity may be considered by males and females as appropriate or inappropriate within interaction and sanctions by the group as a whole.It has also been noticed that the gender of the writer appeared to play a role in the type of topics, interests and hobbies discussed in the letters. In this regard, Clyne (1983:265) argues, “the needs, goals, attitudes, habits and values of the individuals involved represent another source of influence on munication within relationships.” Intrinsic TypesIt has noticed that some of his/hers have attempted to fulfill the PP by including in their invitations some in their invitations some information about the food and custom that they would offer if the recipients accepted their invitations. Consider the example in below:Dear Sara，How are you? How is your brother Jim? I wish you are both very fine, and you are in good health. I would like to take this opportunity to invite you to visit us in DL, where you can visit many places such as coastal road and pole Animal Park. Then I will show you some of our traditions。 and let you taste our special food. And so many other things are waiting for you to see…… and Business Letters Business English letters Field There is no denying the fact that we cam easily recognize a business munication situation. We are subconsciously aware of the nature of the social activity and expect the participants to behave in a certain way.Thus what people actually do in such situations determines the field of the foreign trade letters. The “macrofunction” of language is that of buying and selling, the “microfunctions” depends on the peculiarities of each situation.Nowadays, the business world is busily running. Everyday, the businessmen will handle a lot of telephone calls and dozens of transactions. Although they are busy in managing everything, they should acknowledge that they would be rather careful and considerate with their customers. Otherwise, their mistake or careless fault will possibly result in failure or great loss in their business. Therefore, they should always keep their subject in mind. What they will do to deal with the signing of the contract? Is it appropriate to write a letter in this way? Is it economical to handle the business in this way? How can I remain the good and longstanding relationship with my customers? Is my bid tender petitive pared with the other bidders?…The businessmen take all these factors into consideration and then decide how to manage them. These factors, as a result, form the field of the business letter. The field of the business letter is to obtain plete understanding between the parties involved, and elicit the response required. The first objective can be achieved through clarity of expression。 the second demands the right approach. This means that the businessmen should be courteous, honest, tactful and genuinely interested in promoting a mutually beneficial business arrangement, taking into account their customers’ requirements, level of understanding, and probable reaction to the information. Tenor The tenor of the foreign trade letters relates to the role relationship between participants in such situations. The social roles have already been observed and very well defined, . customer/shopkeeper, consumer/producer, etc. Now considering the ultimate purpose of the shopkeeper or producer, there is a lot of persuasion, be it gentle or other, to effect a transaction. People are in business to make money and not to waste time. This paramount concern with effecting a business transaction and making, money affects the “interpersonal” function of language (Halliday, 1976). However, this function is realized differently due to the status of the client in each case. By rule of thumb that affects the interpersonal function is that “the customer is always right” which in turn determines the degree of politeness of the shopkeeper’s language. This is closely related to the degree of formality/informality that is based on how well a customer is known to the shopkeeper. A cordial, cooperative tone in correspondence can do much to establish satisfactory relations, and such relations are important in business.Such considerations in the tenor of the foreign trade letters are necessary as business munication may include other acts in addition to the acts of buying and selling. Promoting goodwill, plaining, apologizing, accepting, rejecting, claiming, demanding and many other acts are part and parcel of some business munication situations. Such acts assume special significance when we consider differences in the mode of discourse, . in written business munication there are already wellestablished subvarieties such as letters of plaint, letters of application, letters of adjustments, etc.As the buyer and the seller have both mon and contradictory interests, it is very important to keep in mind the distinction between certain overlapping concepts: Courtesy overdone may amount to obsequiousness. Sincerity overdone may amount to naivety. In short, any virtue overdone will bring with it some undesirable effect, and propriety is the watch work in distinguishing the right course from the wrong. Mode As this thesis focuses on the written foreign trade letters, the transmission channel is through the written munication. On the other hand, mode deals with the cohesion and textual structure of the written work.On the lexical level, clarity is the first requirement of an effective letter. To acplish this goal, the diction should be short, familiar, and concrete. Try to avoid the big, plicated and abstract words, phrases and jargons.On the syntactic level, a sentence is the basic unit of language containing a subject, a verb or verb phrase and a plement. In foreign trade letters, in order to achieve clarity and pleteness, the sentence should be short and plete. One sentence i