掌握一些经典的英语句子对于提高英语写作技能有极大的帮助。以下是一些经典的句子，包括开头、论述和结尾句，希望对你的英语四级作文有所帮助。
1. Recently, the issue of … has been brought into public focus.
2. Nowadays, more and more people are becoming aware of the significance of …
3. There is a heated debate over …
4. With the rapid development of …, …
5. It is widely acknowledged/accepted/recognized that …
6. In recent years, the phenomenon of … has become quite noticeable.
7. It goes without saying that …
8. There is no consensus of opinions among people as to the view that …
9. Firstly, we must take every opportunity to broaden our knowledge.
10. We should ensure that such behavior does not occur again.
11. There is more than one side to every issue, and all sides must be considered.
12. On one hand, … On the other hand, …
13. To solve this problem, many measures can be taken.
14. It is, therefore, crucial that we take this issue into consideration.
15. This is a difficult question to answer but it gains popularity among people today.
16. Everyone has their own opinion but I personally believe that …
17. The reasons for … are manifold, of which the most striking is …
18. From the above mentioned, we can easily see that …
19. To sum up, it is high time we took effective measures to tackle the issue.
20. The time has come to take the issue of … seriously.
21. There is no easy remedy for the issue of … , but … might be helpful.
22. All things considered, it's high time we put an emphasis on the improvement of ...
23. We may conclude that …
注意，这些句子不能死记硬背，需要根据具体情境灵活运用，才能真正提高你的英语写作能力。同时，建议阅读更多的英文文章和书籍，积累更多的语料和词汇。