1、通过比较和对比方式来论证，这样两个事物、行为或者观点的利弊就非常明显。
Those who believe in the measure say that students benefit a lot from traveling or working for a year before their formal university education. First, they can more broadly acquainted themselves with the society, deepen their understanding of the outside world, and thus better coordinate their objectives of learning with the needs of the society. In contrast, by immediate entrance to university they can not steer the direction of their study well and may display a poor combination of the theory with practice. Second, study at high school is really exhausting, especially when to win college admission. So it is necessary to grant these children a relatively long period of relaxation or buffer, say, traveling or working for a year, to loosen the chords of their brain, so that when they go back to school later again, they can become completely refreshed and rejuvenated.
这篇雅思大作文写作的内容是关于上大学前是否应该用一年的时间来旅游或者工作进行论证。此段的主题是学生在进入大学学习之前花一年时间进行旅游或工作的话，会让他们受益匪浅。
对比点是：进入大学之前一年进行旅游或工作有利于让学生广泛了解社会，加深他们对外界的理解，因此能让他们更好地协调好学习目标和社会的需要。应用这样的雅思大作文写作方法，相对比之下，直接进入大学学习的话，他们不能够把握学习的方向，而且有可能会产生理论和实践相脱节。
通过此番对比，旅游或工作一年对于即将步入大学的学生们的好处是显而易见，段落的主题句得到有力的论证。
2、通过假设进行正反论述。
Then, since the transportation system is the lifeline of a country’s economic activities, its paralysis would lead to the disintegration of the economy, either industry of farming or daylife. Suppose all the means of transportation were halted for lack of oil, factories with insufficient raw materials would have to close, workers would be out of work, and ripe farm crops would have to stay in the fields at the mercy of rain and storms. People would try to store food and the price of all commodities would go up. If we take those power stations run by oil into account, situations would become even worse. In this sense, oil decides the fate of the whole economy and that of the government.
通过假设得出了一系列的可怕的后果，最后再得出结论，这样的结论是发人深省，当然也是最能引起人们广泛重视的，这样的雅思大作文写作方法是最容易给人留下深刻印象的。
以上就是关于对比这种雅思大作文写作方法的介绍，大家可以通过上面的两个例子看到，这两个作用都是在雅思大作文写作中非常有用的，都能起到非常关键的点题作用。所以大家在自己的雅思大作文写作的备考中可以进行适当的应用。