1、It is well-known to us that……（我們都知道……）.....As far as my knowledge is concerned, …（ 就我所知…）
2、Recently the problem of…… has been brought into focus. Nowadays there is a growing concern over ……（最近……問題引起了關註）
3、Nowadays（overpopulation）has become a problem we have to face.（現今，人口過剩已成為我們不得不面對的問題）
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.（互聯網已在我們的生活扮演著越來越重要的角色，它給我們帶來了許多好處但也產生了壹些嚴重的問題）
5、With the rapid development of science and technology，more and more people believe that……（隨著科技的迅速發展，越來越多的人認為……）