英语作文的结尾部分应该简洁、有力，并且能够有效地总结全文或重申主要观点。以下是一些常见的、自然的结尾方式：

重申主题：

在结尾段重新申明文章的主要论点，但要注意变换表达方式，避免重复。例如：

In conclusion, transitioning to renewable energy sources is crucial for addressing climate challenges and creating a healthier planet.

总结论点：

如果作文包含多个分论点，在结尾时把这些分论点予以总结。例如：

Regular physical activity boosts mood, reduces anxiety, and improves cognitive function, making it a natural remedy for mental health challenges. Exercise also enhances overall well-being.

展望未来：

尤其在处理环境、社会等负面主题时，展望未来是一个有效的结尾策略。例如：

If we continue to protect our natural landscapes and invest in sustainable practices, we can look forward to a healthier and more sustainable future.

呼应开头：

为了使文章更具结构感，结尾可以巧妙地呼应开头部分。例如：

As we began our journey towards understanding climate change, it is clear that collective action is essential to mitigate its impact.

引用名言或警句：

在结尾处引用名言或警句，能够为文章增添深度和文采。例如：

As Shakespeare once said, "All's well that ends well."

提出建议或呼吁行动：

在结尾处提出建议或呼吁行动，可以使文章更具号召力。例如：

Therefore, it is imperative that we adopt sustainable practices to ensure the well-being of future generations.

使用总结句式：

如“To sum up,”、“In conclusion,”等，这些句式能够清晰地概括文章的主要内容。例如：

To sum up, the benefits of exercise are numerous, and incorporating them into our daily routines can lead to significant improvements in our mental and physical health.

激发思考：

在结尾处提出引人深思的问题，可以激发读者的思考，使文章更具互动性。例如：

What if we could find a way to harness the power of renewable energy to completely eliminate our carbon footprint？

选择合适的结尾方式不仅能够使文章更加完整和有力，还能给读者留下深刻的印象。根据文章的内容和主题，选择最适合的结尾方式，可以使你的英语作文更加出色。