開題：描述的方式來引出要議論的主題。

　　以敘代議 常見：

　　As we can see , has become a very important problem in the rapidly developing world.

　　Adimttedly,  has attracted more and more attention from people.

　　As we know. Bring us many b123fits and conviences.

　　Judging from that fact, it is very obvious thathas become part of our everyday life to some extent.

　　The emergence of  is really worth our respect in history while it still remains meaningful to us now.

　　個人描述：以個人的親身經歷來引起要議論的問題。

　　Once, I had the experience of

　　I can never forget the experience of

　　Personally, at first sight of this topic, I could not help thinking about the

　　引用名言式：用一個相關的諺語、術語、名言或名人實例來引題。

　　Just as the saying goes,

　　The saying that comes to me at the first sight of this topic.

　　在引題時要注意不要照抄原題， 而且篇幅不宜過長，在引題之后，迅速進入自己所支持的觀點，或表態(tài)，并引起下文。

　　論述L詳細闡述分支觀點的部分，在開題首段的第二句一般是文章的主旨句所在，而在論述部分的理由段中，各個分論點應該放在首句的位置，開門見山。