◆ Recently， sth'/the problem of……has been brought to popular attention/ has become the focus of public concern……(e。g。 Recently， the problem of unemployment has been brought to such popular attention that governments worldwide are committed to finding useful solutions.)

◆ In the past few years，there has been a boom/sharp growth/decline in……(e。g。 In the past ten years，there has been a sharp decline in the number of species。)

◆ Nowadays，more/most important/dangerous for our society is……(e。g。 Nowadays， most dangerous for our society is the tendency to take advantage of each other in political circles。)

◆Now there is a growing awareness that+同位语从句...

◆It is time we explore the truth of ...

进一步提出观点：

◆…of them hold the opinion that ….(不同观点)

◆…of them are in favor of the idea that…(不同观点)

◆People who are for/against the idea think …(不同观点)

◆However, each coin has two sides. (不同观点)

◆Different from those…., …people think ….(不同观点)

◆On the other hand, … people object that (有些人反对道…).(不同观点)

◆A is but one of the many effects. Another is ...

◆Besides, other reasons are...

提出假想例子的方式：

◆Suppose that...

◆Just imagine what would be like if...

◆It is reasonable to expect...

◆It is not surprising that...

举普通例子：

◆For example(instance),...

◆... such as A,B,C and so on (so forth)

◆We can take something for example.

◆A particular example for this is...

引用：

◆One of the greatest early writers said ...

◆Knowledge is power, such is the remark of ...

◆As somebody once put it, “…”

◆....... How often we hear such words like these.

提出原因：

◆There are many reasons for ...

◆Why .... ? For one thing,... ; for another thing,…

◆The answer to this problem involves many factors.

◆Most people would agree that...