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1、引出開篇類：Recently the problem of…… has been brought into focus. ==Nowadays there is a growing concern over ……(最近……問題引起了關注)。

2、提出建議類：There is no doubt that enough concern must be paid to the problem of……(毫無疑問，對……問題應予以足夠重視)。

3、故事引出類：I have a friend who ... Should he....? Such a dilemma we are often confronted with in our daily life.

4、表達不同觀點類：Peoples views on……vary from person to person. Some hold that……However, others believe that……(人們對……的觀點因人而異，有些人認為……然而其他人卻認為……)

5、預示后果類：Obviously，if we dont control the problem, the chances are that……will lead us in danger.(很明顯，如果我們不能控制這一問題，很有可能我們會陷入危險)。