英语作文告诫作文的写作结构通常包括以下几个部分：

开头

称呼：首先使用适当的称呼，比如 "Dear [Friend's Name]," 或 "Dear Sir/Madam,"。

开场白：简短地说明写信的目的，例如 "I am writing to share with you my opinion about..." 或 "I am writing to caution you about..."。

主体

问题阐述：清楚地描述你所告诫的问题或情况，可以分段阐述，使内容条理清晰。

建议与看法：提出具体的建议或表达你的看法，用以指导对方如何避免问题或应对情况。

结尾

美好祝愿：表达对对方的良好祝愿，例如 "I hope you take my advice into consideration." 或 "I wish you all the best."。

结束语：使用适当的结束语，如 "Best regards," 或 "Sincerely,"。

署名：在结束语下方签上自己的名字。

示例结构

开头：

Dear [Friend's Name],

I am writing to caution you about the recent incident that occurred in our neighborhood.

主体：

I heard that someone was robbed last night, and this has left my mother very scared. She has advised me not to go out very late or to avoid places that are not well-populated. I understand her concern and have decided to be more cautious.

结尾：

I hope you stay safe and follow my mother's advice. Take care and let me know if there is anything else I can do to help.

Best regards,

[Your Name]

常用句型

I am writing to share with you my opinion about...

I am writing to caution you about...

It is important to...

Please be careful not to...

I suggest that you...

I hope you take my advice into consideration.

写作技巧

保持简洁明了：避免冗长和复杂的句子，使作文易于理解。

使用具体例子：通过具体的例子来支持你的观点，使作文更有说服力。

注意语气：告诫作文的语气应保持友好但坚定，避免过于强硬或命令式。

校对和修改：在完成作文后，务必仔细校对，检查语法和拼写错误，确保作文无误。

通过以上结构和技巧，你可以撰写一篇清晰、有说服力的英语告诫作文。希望这些信息对你有所帮助!