雅思大作文-----主体段的论证方法
对于考生来说，对于某一话题说出一两个分论点并不是难点，而对这些分论点进行论述的展开部分（extend and support main ideas) 却是一个必修的部分。

在议论文中常用的论证方法主要有四种。

一，举例论证法
二，因果论证法
三，对比论证法
四，反证法
一，举例论证法
例如，你想证明一个事情的坏处，可以把这些坏处罗列出来。

However, there are certainly dangers in taking time off at that important age. Young adults may end up never return to their studies or finding it difficult to re-adapt to an academic environment. They may think that it is better to continue a particular job or perhaps they may do something completely different from a university courses.
常用引导词
for example,
for instance,
...as follows
such as
that is to say
just as
including
in particular,
to be specific,
练习1：
Only under the supervision of a teacher can students study effectively.
To be specific, a teacher always tries to draw students' attention during class and assign them homework to do after school. Generally teachers keep in touch with the parents in order to ensure that proper learning is taking place.
练习2：
请用举例论证法拓展以下提纲中的convenient
distance-learning programme:
1. convenient
2. cheap
(不但可以具体说明如何便利，还可以把受益的人群具体化）
Students do not need to travel to school or attend classes at a fixed time if they register a distance-learning programme. This convenience means much to some group of people with special need to get education, such as full-time workers who are busy with working, mothers who have to take care of their babies, disabled people or those who admire to access a foreign university but cannot leave their homeland.
练习3：
请用举例论证拓展“大学通过各种活动来发展学生的各种综合能力”
In addition to academic knowledge, a university is supposed to equip students with many other skills, including leadership and organizing skills developed by working for students' union, cooperation and social skills gained through participating in various clubs in campus.。