一、引出开头

　　1：It is well-known to us that==As far as my knowledge is concerned,

　　2：Recently the problem of has been brought into focus. ==Nowadays there is a growing concern over

　　3：Nowadayshas become a problem we have to face.

　　4：Internet has been playing an increasingly important role in our day-to-day life. It has brought a lot of benefits but has created some serious problems as well.

　　5：With the rapid development of science and technology，more and more people believe that

　　6：It is a common belief that==It is commonly believed that

　　7：A lot of people seem to think that

　　8：It is universally acknowledged that + 句子

　　二、表达不同观点

　　1：Peoples views onvary from person to person. Some hold thatHowever, others believe that

　　2：People may have different opinions on

　　3：Attitudes towards vary from person to person.==Different people hold different attitudes towards

　　4：There are different opinions among people as to

　　三、表示结尾

　　In short, it can be said that