英语大作文的写作步骤和技巧如下：

审题

仔细阅读题目，明确写作要求和主题。

确定文章的中心思想和论点。

列大纲

在草稿纸上列出文章的大体框架，包括每段的核心要点。

如果有时间，可以背过一些相关模板，结合句型进行仿写。

写作

第一段：

描述图画内容，简单交代漫画所折射的主题。

字数控制在60-80词之间为宜。

第二段：

阐述寓意，展开叙述漫画的背后逻辑。

如果漫画对应的是社会现象，可以阐明该现象出现的原因，通常列举两个原因即可。

如果漫画对应的是抽象品质，可以举用名人事迹来说明该品质的好处，通常列举一个例子即可。

这部分内容字数最多，应控制在80-120词为宜。

第三段：

发表见解，进一步说明这种社会现象或抽象品质对于社会所起到的作用或影响。

可以结合这种作用和影响给出相应的建议措施。

这部分内容字数不宜过多，控制在20-30词即可。

检查

写完后，检查拼写、语法和字数等问题。

确保文章结构清晰，逻辑连贯。

润色

使用适当的过渡句和过渡词，使文章流畅。

注意词汇的选择和句式的多样性，避免重复使用相同的句式。

确保卷面整洁，避免涂改。

Title: The Impact of Social Media on Teenagers

Paragraph 1：

Emerging from the picture is a funny but enlightening scene that highlights the excessive use of social media among teenagers. As is abundantly depicted in the above picture, teenagers are constantly checking their phones, spending a significant amount of time on social media platforms.

Paragraph 2：

This phenomenon has generated a great concern among parents and educators. The general public's interest has been stimulated by this picture, as it raises questions about the impact of social media on teenagers' mental health and academic performance. Reports indicate that excessive use of social media can lead to issues such as anxiety, depression, and decreased productivity.

Paragraph 3：

To address these concerns, schools and parents should encourage teenagers to maintain a healthy balance between their online and offline activities. Limiting screen time and promoting outdoor activities can help teenagers develop a more balanced lifestyle. Additionally, educators can incorporate digital literacy into their curriculum to help students navigate social media more effectively.

通过以上步骤和技巧，你可以撰写出一篇结构清晰、内容充实、语言准确的英语大作文。