1. Introduction的作用：
An introduction is crucial, not just for what it says about the topic, but for what it tells the reader about writer’s style and approach. Unless you can introduce the subject clearly the reader may not wish to continue.
For a relatively short essay written under exam conditions, the following are worth including, in this order.
a. Definitions of any terms in the title those are unclear
b. Some background information
c. Reference to other writers who have discussed this topic
d. Your purpose in writing and the importance of the subject
e. A summary of the main points you intend to cover
2.雅思大作文写作类型：
雅思task 2一共有两种类型，第一种为Argumentation, 第二种为Report。
Argumentation:
1)给出一种观点-------Do you agree or disagree?
Nowadays computer are widely used in education. As a result, some people think teachers no longer play important roles in classrooms.
To what extent do you agree or disagree?
2)给出两种对立的观点-------Discuss both views and give your own opinions.
Some people argue that there are no basic differences between the way men and women approach academic study. Others insist that there are big differences in areas such as organization, attitude and ambition.
Discuss both views and give your own opinion.