本文提供的是英語專四大作文寫作必備三原則，希望對同學們有所裨益。

　　1. 三段論原則

　　全文多數情況下分三段。首段與末段都是兩句至四句之間，也有五句的情況。中間的一段句子個數肯定會多一些。首段與末段的結論結構都是“總+分”，也有 “總+分+總”的情況。首末段極其重要，所以我們一定要多加操練。也有寫成四段的情況，注意這時中間可能有兩個段落，但首末段的寫法不變，突出其特殊的地位。

　　2. 組詞成段原則

　　列出每段關鍵詞, 每個詞代表一個句子, 然后寫出該詞代表的句子, 最后將句子串成一段。這樣可以盡快使你的思維點連貫起來, 快速成段。

　　以1992年考題“For a better understanding between parents and child”為例, 介紹一下這種寫作方法:

　　第一步, 我們要仔細閱讀“outline”, 然后在寫第一段(present situation)的時候會聯想到下列關鍵詞匯:誤會, 誤解—— misunderstanding; 理解——understanding; 抱怨——complain; (父母)過時了—— old?fashioned 或者 behind the times; (向老師或同學)尋求幫助——seek help from...

　　第二步, 通過這些詞匯我們可以造出句子:

　　misunderstanding—Nowadays there is often a misunderstanding between parents and children.understand—Parents find it difficult to control or even understand their children.complain, old?fashioned—Child complain that their parents are too“old?fashioned”to agree withwhat their children say and do.behind the times—Many children often say that his or her parents are just hopelessly behind thetimes.seek help from—The children will seek help from their friends or teachers instead of from theirparents.

　　第三步，根據以上句子，我們在句與句之間加入合適的關聯詞，就可以組成段落了:

　　Nowadays there is often a misunderstanding between parents and children.On the one hand,parents findit difficult to control or even understand their children.On the other hand, Childrencomplain that their parentsare too“old?fashioned”to agree with what their children say and do.Sowhenever children are in trouble,they will seek help from their friends or teachers instead of fromtheir parents.

　　3. 句型多樣化原則

　　每段構造1—2個長句。使得文章長短句搭配合理, 行文流暢。這就要求考生在備考時適當地背誦仿寫一些長句, 這樣大家寫作中的句型就可以豐富起來，效果也就會好得多。

　　請大家仔細揣摩下列段落中精彩的長句, 并進行仿寫:

　　1) There are many ways to keep fit.Firstly, enough exercises is necessary.People can play basketball or table tennis if they have enough time at their disposal.Secondly, proper eating habitsare indispensable。That is to say, never eat too full at lunch while ignoring breakfast, and never takein too much sugar or fat　while overlooking vegetables and fruits.Thirdly, high spirits arehelpful.Laughter and humor always makepeople healthy, but anger and anxiety often result inillness.Besides, it is advisable for people to have their　physical checkup regularly and to give up badhabits such as smoking and drinking.

　　2) To bridge this generation gap between parents and children, both of them should be cooperative.For children, they should be considerate of parents for the sake of their hard work.As forparents, theyshould be tolerant toward children.If both of them can take the first step by actuallytalking to one another,it won't be long before the arrival of a better understanding betweenparents and children.

　　3) As for me, I prefer to live in the city.First, I can enjoy the conveniences offered by ourcivilization.Senond,compared with the undeveloped factors of the country, a city is an ideal placefor me to make a contribution.Of course, I like to take my vacations in the country, relaxing andappreciating the quiet and peacefulnatural beauty.

　　4) As can be seen from the pictures, smoking is every bit a very harmful habit.Physically, it causes threemillion deaths in the world every year.Financially, it results in a yearly loss of 200 millionU.S.dollars eitherspent on cigarettes or lost in fire accidents caused by smoking.Yet, despite allthese facts, there are stilla lot of people who are still addicted to smoking.According to officialreports, among the 5.8 billion peopleof the world, 1.1 billion are smokers, which take up 20% ofthe total world population.

　　5) There are three reasons for this effect.Firstly, with the rapid growth of human population, much spacehas been either occupied or destroyed in the process of industrialization and urbanization.Asa result,the space for wildlife to survive is becoming less and less.Secondly, the seious ecologicalproblem,including deforestation, overgrazing and all kinds of pollution, has also done great harm towildlife.Finally,a lot of wildlife species are killed for food, for money, or even for fun, which alsoquickens the extinction of some rare wildlife.

　　6) Nowadays promise making has become a fashion in every field.But as is shown in the cartoon,some of the promises turn out to be false and deceptive.Just like the most common eggs laid bythe hen, whatenterprises pledge to fulfill is virtually what they should do.

　　7) As for the crisis, we should take active and effective measures as quickly as possible.Above all,inorder to keep the balance of ecology in the sea, forbidding commercial fishers to go fishing incertain periods of time and areas.Aside from that, all laws and regulations against pollution shouldbe forcefully implemented.Unless we try our best to restore the balance of ecology, there will be noresources availablefor us to survive.

　　8) Chinese culture is gaining worldwide acceptance.For one thing, Chinese culture, long in history,varied in form and rich in content, has remained one of the most original, ingenious and vitaltraditions among all civilizations.For another, China's success in development lays solid basis for theintroduction of its national culture to other countries.

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