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       首要，雅思写作一个阶段有必要有一个中心即主题思想，该中心由主题句特别是其间的题旨来表达。整个阶段有必要紧扣这个主题(stick or hold to thetopic)，这就是阶段的统一性(unity)。

　　其次，一个阶段有必要有若干推展句，使主题思想得到充沛展开，然后给读者一个完好的感觉，这就是完好性(completenessoradequateness)。

　　再者，一个阶段不是乱七八糟的，而是有机的组合，语句的摆放次第有必要合乎逻辑，从一个语句到另一个语句的过渡有必要流通(smooth)，这就是连贯性(coherence)。

　　1. 统一性

　　一个阶段内的各个语句有必要从属于一个中心，任何游离于中心思想之外的语句都是不可取的。请看下例：

　　Joe and I decided to take the long trip we'd always wanted across thecountry. We were like young kids buying our camper and stocking it with all thenecessities of life. Bella bakes the best rhubarb pie. We started out in earlyspring from Minneapolis and headed west across the northern part of the country.We both enjoyed those people we met at the trailer park. Joe received a watch athis retirement dinner. To our surprise, we found that we liked the warm southernregions very much, and so we decided to stay here in New Mexico.

　　本段的主题句是段首句，controlling idea(中心思想)是take the long trip across thecountry。文中呈现两个irrelevant sentences，一个是Bella bakes the best rhubarb pie，这一段是讲的是Joe and I ，中心呈现一个Bella是不合适的。还有，Joe received a watch at his retirementdinner这一句更是与主题句不相关。考生在四级统考的作文卷上常常由于造出 irrelevantsentences(不相关语句)而丢分，值得引起留意。再看一个比方：

　　My name is Roseanna, and I like to keep physically fit. I used to weigh twohundred pounds, but I joined the YMCA for an exercise class and diet program. Inone year I lost eighty pounds. I feel much better and never want to have thatmuch weight on my five-feet frame again. I bought two new suitcases last week.Everyday I practice jogging three miles, swimming fifteen laps, liftingtwenty-pound weights and playing tennis for one hour. My mother was a prematurebaby.

　　本段的controlling idea 是like to deep physically fit，但段中有两个irrelevantsentences，一个是I bought two new suitcases last week，另一个是My mother was a prematurebaby。

　　从上面两个比方能够看出，native speakers相同会造出来irrelevantsentences。卷面上假如这种语句多了，形成偏题或离题，那问题就更严峻了。

       2. 完好性

　　正象我们前面说得那样，一个阶段的主题思想靠推展句来完结，假如只要主题句而没有推展句来进一步交待和充分，就不能构成一个完好的阶段。相同，虽然有推展句，但主题思想没有得到相对满意的交待，给读者一种意犹未尽的感觉。这样的阶段也不能完结其外交功用。例如：

　　Physical work can be a useful form of therapy for a mind in turmoil. Workconcentrates your thoughts on a concrete task. Besides, it is more useful towork ---- you produce something rather than more anxiety or depression.

　　本段的主题句是段首句。本段的两个推展句均不能答复主题句中提出的问题。什么是 "a mind in turmoil"(心境不平静)Physicalwork又怎样能改动这种状况?为什么它能起therapy的效果?读者得不到明确的答案。

　　段首句所表达的主题思想是一种看法，有必要有详细案例加以验证。上述两个推展句只是在文字上对主题作些解说，整个阶段内容空洞，简而不明。假如用一两个详细的比方的话，就能够把主题解说清楚了。比方下段：

　　It is not always true that a picture is worth a thousand words. Sometimes,pictures are pretty useless things. If you can't swim and fall in the river andstart gulping water, will you be better off to hold up a picture of yourselfdrowning, or start screaming "Help"?

　　3.连贯性(coherence)

　　连贯性包含意连和形连两个方面，前者指的是内涵的逻辑性，后者指的是运用转化词语。当然这两者常常是不可分割的。只要形连而没有意连，语句之间就没有内涵的有机的联络;反之，只要意连而没有形连，有时行文就不行流通。

　　1) 意连

　　阶段中语句的摆放应遵从必定的次第，不能想到什么就写什么。假如在着笔之前没有构思，边写边想，写写停停，那就写不出趁热打铁的好文章来。下面介绍几种常见的摆放方法。

　　A.按时刻先后摆放(chronological arrangement)

　　We had a number of close calls that day. When we rose, it was obviouslylate and we had to hurry so as not to miss breakfast; we knew the dining roomstaff was strict about closing at nine o'clock. Then, when we had been drivingin the desert for nearly two hours ----- it must have been close to noon ----the heat nearly hid us in; the radiator boiled over and we had to use most ofour drinking water to cool it down. By the time we reached the mountain, it wasfour o'clock and we were exhausted. Here, judgement ran out of us and we startedthe tough climb to the summit, not realizing that darkness came suddenly in thedesert. Sure enough, by six we were struggling and Andrew very nearly went downa steep cliff, dragging Mohammed and me along with him. By nine, when the windhowled across the flat ledge of the summit, we knew as we shivered together forwarmth that it had not been our lucky day.

　　本段从 "rose"(起床)写起，然后是吃早餐("not to miss breakfast", "closing at nineo'clock")，然后是 "close to noon"，一向写到这一天完毕("By nine--")。

　　B. 按方位远近摆放(spatial arrangement)。例如：

　　From a distance, it looked like a skinny tube, but as we got closer, wecould see it flesh out before our eyes. It was tubular, all right, but fatterthan we could see from far away. Furthermore, we were also astonished to noticethat the building was really in two parts: a pagoda sitting on top of a tubularone-story structure. Standing ten feet away, we could marvel at how much of thepagoda was made up of glass windows. Almost everything under the wonderfulChinese roof was made of glass, unlike the tube that it was sitting on, whichonly had four. Inside, the tube was gloomy, because of the lack of light. Then asteep, narrow staircase took us up inside the pagoda and the light changeddramatically. All those windows let in a flood of sunshine and we could see outfor miles across the flat land.

　　本段的写法是由远及近，从远处("from a distance")写起，然后"get closer"，再到(" ten feet away")，最终是"inside the pagoda"……当然，按方位远近来写不等于都是由远及 近。根据需要，也能够由近及远，由表及里等等。

       C. 按逻辑关系摆放(logical arrangement)

　　a. 按重要性次第摆放(arrangement in order of importance)

　　If you work as a soda jerker, you will, of course, not need much skill inexpressing yourself to be effective. If you work on a machine, your ability toexpress yourself will be of little importance. But as soon as you move one stepup from the bottom, your effectiveness depends on your ability to reach othersthrough the spoken or the written word. And the further away your job is frommanual work, the larger the organization of which you are an employee, the moreimportant it will be that you know how to convey your thoughts in writing orspeaking. In the very large business organization, whether it is the government,the large corporation, or the Army, this ability to express oneself is perhapsthe most important of all the skills a man can possess.

　　这一段谈的是表达能力，它的重要性与职业，身份有关，从"not need much skill"或 "of little importance"到"more important"，最终是 "most important"。

　　b.由一般到特别摆放(general-to-specific arrangement)

　　If a reader is lost, it is generally because the writer has not beencareful enough to keep him on the path. This carelessness can take any number offorms. Perhaps a sentence is so excess.