1、Recently, the problem of … （比如环境污染、就业问题或者某些社会现象）has aroused people‘s concern. 最近,……问题已引起人们的关注.
2、Nowadays, (overpopulation或者其他的东西) has become a problem we have to face.
3、The Internet（或者其他东西如科技、机器人、自动化等） 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.互联网已在我们的生活中扮演着越来越重要的角色.它给我们带来了许多好处,但也产生了一些严重的问题.
4、It is commonly believed that … / It is a common belief that … 人们一般认为……
5、Many people insist that … 很多人坚持认为……
6、With the development of science and technology, more and more people believe that…
7、A lot of people seem to think that … 很多人似乎认为……
8、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……
9、People may have different opinions on …人们对……可能会有不同的见解.
10、There are different opinions among people as to …关于……，人们的观点大不相同.
The Changes of My Hometown
My hometown is located at the outside of the city.
I was born and grew up there. It was a little village with natural scenery of green mountains, a beautiful river and lovely village houses. In the summer, I liked to go to picnic under the mountain and swim in the river.
But now my hometown has changed. The mountains were blown down to build the factories, and the river was polluted by the waste water from those factories. There are no more green mountains but the smoking factories. The water of the river turns black and stinks, and I can never swim in it again. The village houses are gone too, and the ugly storied houses with walls are there instead.
I don t like the changes of my hometown, it is a polluted hometown.