1 Types of Words(词的种类) In the English language,there are over half a million words.No one can possibly use SO many words.In reality,only a small part of common words are used in most cases,which is what we should learn first.1.1 Formal and Informal Words(正 式与非正式词) Words can be formal or informal in style.Words of different styles serve different purposes on different occasions. Formal words are those that are used on formaI occasions.For example: (1a)Would you please inform me of the possibility that the terms we mentioned will enable you to expedite the shipment two weeks ahead of schedule? (贵方能否告知是否可能按照我方的条款要求提前两周发货?) This is a typical,formal business English sentence,and the words jnform,terms,and expedite are formaI.words. Informal words are those that are used in info,7na,situations,such as in conversations between close friends or family members.In such cases,Example(1a)can be expressed like this: (1b)Could you tell me if you can send the goods two weeks ahead of time according to our terms? In Example(1b),words like tell,if,send and goods sound informal.Informal words are often colloquial words. It is important to note that some words are neutral because they are neither very formal nor very informal.As a matter of fact,there are different degrees of formality.Certain words can be used in both formal and informal situations.Words like know,whether,able,and ship,for example,are neutral.Therefore Example(1b)can be expressed as: