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  　阶段主题句呈现得最多的方位即是段首。

　　英语文章中最多的即是演绎型的写法，由于西方人喜欢开门见山，所以他们常常在每一段的榜首句话就先交代出这段话的主旨。这是最简单的，也是最常见的主题句方位，如下面这个比如：

　　As a child grows up, he learns how to behave in ways that is appropriate to the society into which he is born. That is to say, he acquires the patterns of behavior that are accepted as normal in his society. This process of social learning is generally referred to as socialization. By socialization, then, we mean the process whereby individuals learn the rules, values and practices of the society in which they live.

　　上面这段话中的榜首句即是对整体阶段大意的一个介绍;从第二句话中的“That is to say”能够看出来，第二句话是对榜首句话的解说;第三句话中的“This process”也是代指的前一句话中的学习，老练进程。而最终一句话也是对社会化的一个解说，所以也能够断定榜首句话即是阶段的主题句。

　　除了榜首句以外，主题句也也许呈现在段首方位的第二句。那什么时候会呈现这种状况呢?分红三种状况：

　　(1)当首句是问句时;

　　(2)当首句是过渡句时;

　　(3)当次句为转机句时。

　　在这些状况下，第二句话都会比榜首句话更主要，所以主题句也更也许呈现在第二句话中。例如下面这句话：

　　What then makes people left-handed if it is not simply genetic? Other factors must be at work and researchers have turned to the brain for clues. In the 1860s the French surgeon and anthropologist, Dr Paul Broca, made the remarkable finding that patients who had lost their powers of speech as a result of a stroke (a blood clot(凝聚) in the brain) had paralysis(麻痹) of the right half of their body. He noted that since the left hemisphere of the brain controls the right half of the body, and vice versa(反之亦然), the brain damage must have been in the brain’s left hemisphere, Psychologists now believe that among right handed people, probably 95 percent have their language centre in the left hemisphere, while 5 percent have right-sided language.

　　榜首句话发问：“假如不仅是基因让人们习惯于用左手，那还有什么因素呢?”咱们能预测出，接下来这段话应当就会给咱们介绍除了基因以外的别的因素。正巧第二句话说：“别的的因素也起到了效果，研究者将头绪转向人类大脑方面。”所以能断定，所谓的“别的因素”即是指的“人类大脑”，所以主题句也即是第二句话。

　　另外一个常呈现阶段主题句的方位则是段尾。

　　这种景象常呈现在概括型的文章里。所谓概括型，则是先陈说景象，最终总结规则。因而这类的文章通常会呈现一些总结性的词：Therefore/ Hence/ Thus/ So/ Consequently/ Accordingly/ As a result/ As a consequence;或者会呈现一些研究报告类的词组The research findings/ the study/ the investigation/ the analysis/ the evidences show/ reveal/ imply/ indicate/ suggest/ demonstrate / prove that…;乃至有的会直接呈现总结型主题句：In short/ In general/ All in all/ To sum up/ In summary/ On the whole…咱们一同剖析下面这个例句：

　　The only species which demonstrated(证明，证明) near normal productivity(生产力) was Cassin’s Auklet(卡森的海雀), in which the value for 1998 exceeded the long-term mean by 16 percent. However, given that very few Cassin’s Auklets attempted to breed(生产，繁殖), island-wide offspring(后代) production was extremely low. In short, these observations were quite similar, with slight variations, to observations made on the Farallon(法拉龙) seabird community in other severe E1 Nino years.

　　在这段话的榜首句中，咱们就发现了刚刚总结过的一个关键字“demonstrated”，可是咱们不难发现，这个当地是“demonstrated”是属于which这个定语从句中的，所以不是对整段话，乃至整篇文章的总结。

　　所以雅思代报排除了榜首句话是主题句的也许性。第二句呈现了转机，那咱们又知道转机句后边的必定比前面主要，所以接着往下看这句话。可是，看完这句话以后，咱们不难发现，最终一句话用了一个总结型的句子：“In short”，所以一下就能断定该段话的主题句即是最终一句话。

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