以下是一些常用的英语四级作文万能句，可以根据具体的作文题目和内容进行适当的调整和运用：

1. 引言句：
- Nowadays, it is widely acknowledged that...
- With the development of society, the issue of...has drawn much attention.
- In recent years, there has been a growing concern about...

2. 表达观点：
- From my perspective, I firmly believe that...
- Personally, I am convinced that...
- In my opinion, it is clear that...
- It is widely accepted that...

3. 表达原因：
- There are several reasons behind this phenomenon.
- The first reason can be attributed to...
- Another contributing factor is...
- One of the main causes is...

4. 表达优势与劣势：
- On the one hand, there are several advantages to...
- On the other hand, there are some drawbacks to...
- Despite the benefits, there are also some disadvantages to...

5. 表达解决方法：
- To tackle this issue, it is essential to...
- One effective approach is to...
- Another possible solution is to...
- It is crucial to take immediate action to...

6. 表达结论：
- In conclusion, it is evident that...
- All in all, it can be concluded that...
- Based on the above analysis, we can draw the conclusion that...
- Taking all these factors into consideration,