一、引出开篇类

1.Recently the problem of…… has been brought into focus.=Nowadays there is a growing concern over ……(最近……问题引起了关注)

2.With the development of our economy and society，pollution is more and more serious.

3.Now people become increasingly aware/conscious of the importance of ……

二、提出建议类

1.There is no doubt that enough concern must be paid to the problem of……(毫无疑问，对……问题应予以足够重视)

2. Obviously ,if we want to do something … it is essential that……(显然，如果我们想要做么事，很重要的是……)

三、故事引出类

1 .I have a friend who ... Should he....? Such a dilemma we are often confronted with in our daily life.

2. Once upon a time, there lived a man who .... This story may be (unbelievable)， but it still has a realistic significance now。

四、表达不同观点类

1.People's views on……vary from person to person. Some hold that……However, others believe that……(人们对……的观点因人而异，有些人认为……然而其他人却认为……)

2. There are different opinions among people as to……(对于……人们的观点大不相同)

五、预示后果类

1. Obviously，if we don't control the problem, the chances are that……will lead us in danger.(很明显，如果我们不能控制这一问题，很有可能我们会陷入危险)

2. It is urgent that immediate measures should be taken to stop the situation(很紧迫的是应立即采取措施阻止这一事态的发展)

六、引用名言类

1. Education is not complete with graduation. This is the opinion of a great American philosopher. Now more and more people share his opinion.