英语四六级作文中的一些经典句子包括：

1. It is well-known to us that…（我们都知道……） == 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……问题引起了关注）

3. Nowadays（overpopulation）has become a problem we have to face.（现今，人口过剩已成为我们不得不面对的问题）

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.（互联网已在我们的生活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）

5. With the rapid development of science and technology, more and more people believe that…（随着科技的迅速发展，越来越多的人认为……）

6. It is a common belief that…==It is

7. Nowadays, with the rapid development of society and technology, an increasing number of issues have emerged.（如今，随着社会和科技的快速发展，越来越多的问题出现了）

8. In recent years, the topic of... has been brought into focus and has been widely discussed.（近年来，...话题成为焦点并被广泛讨论.....）

9. It is commonly acknowledged that..plays a significant role in our daily life人们普遍认为....在我们的日常生活中起着重要作用。

10. When it comes to... different people have different views.（当提及……时，不同的人有不同的看法。

这些句子在英语四六级作文中非常实用，可以帮助考生更有效地表达自己的观点。