英语四级作文开头可以使用以下几种万能句型：

问题引起关注句型:

Recently, the problem of [具体问题] has aroused people's concern.

问题普遍存在句型:

It is well-known to us that [问题] is one of the most serious problems in today's society. We can see it almost everywhere.

引出话题句型:

Have you ever thought about [话题]？

利弊对比句型:

[事物/现象] has both advantages and disadvantages. For example, [具体例子]… However, just as every coin has two sides, [事物/现象] also has its disadvantages.

强调重要性句型:

In the midst of [背景或情境], the focus on [主题] has never been more crucial.

经验法则句型:

There is an old saying that [引用谚语或经验法则]… However, it is correct in many cases even today.

选择合适的开头句子能够吸引读者的注意力，为你的作文奠定良好的基础。希望这些建议对你有所帮助，