写一篇高中英语作文表达对某事有意见的思路，可以遵循以下几个步骤：

1.明确观点：开头要说明自己的观点，表达出自己对某件事情的不满或者看法。

2.列举原因：接着需要在主体部分阐述自己的理由，比如为什么会有这样的不满，或者为什么会有这样的看法。需要说服别人，理由应该充足、严谨。

3.提供证据：不仅要列举自己的理由，还需要提供相关的“证据”，比如官方数据、书面材料、调查结果、亲身经历等等。这些证据可以加强自己的论证，让别人信服。

4.提出建议：最后需要为自己的观点提出建设性的建议和解决方案，给出可行性高的建议，证明自己的观点是正确的。

5.总结：最后进行总结，强化上述几点内容，并再次重申自己的观点和立场。

总而言之，写一篇关于对某事有意见的高中英语作文，需要明确自己的观点，提供充分的理由和证据支持，提出可行的建议和解决方案，并进行总结和强化。同时，需要注重语言表达的准确性和流畅性，让文章更加有说服力。

假定你是李华，你校外教要举办口语培训班，让练习口语的所有的学生两人一组练习，随机挑选两个人分成一组练习，你对此有意见，用80字英语说说原因和提建议。

参考作文：

As a student who is interested in improving my oral English skills, I appreciate the outside teacher's initiative to organize a spoken English training course. However, randomly pairing students up without considering their speaking ability or progress may not be effective as each student has different levels and weaknesses. In view of this, I suggest that the teacher could first assess the students' language proficiency and then group them according to their levels or interests. In this way, students can learn from each other better, and the training can be more targeted and purposeful.

重点词汇：

-initiative n. 主动性、首创精神

-spoken English n. 口语英语

-training course n. 培训课程

-randomly adv. 随机地、任意地

-speaking ability n. 口语能力

-progress n. 进步、进展

-effective adj. 有效的、生效的

-proficiency n. 熟练、精通

-group v. 分组、分配

-level n. 水平、层次

-interests n. 兴趣爱好

-targeted adj. 有针对性的、有目的的

-purposeful adj. 有意义的、有目标的

参考作文：

As a student, I have concerns about the proposed format for the oral training class where students are randomly paired up for practice. While I understand the intention to promote speaking practice, random grouping may not be effective for everyone. Some students may feel uncomfortable or lack confidence practicing with a stranger. 

My suggestion would be to allow students to choose their own partners based on shared interests or language proficiency. This would foster a more comfortable and productive learning environment. Additionally, the teacher could provide guidance and feedback during the practice sessions to help students improve their speaking skills.

重点词汇：

-Proposed format - 提议的形式

-Random pairing - 随机匹配

-Speaking practice - 口语练习

-Lack confidence - 缺乏自信

-Comfortable learning environment - 舒适的学习环境

-Productive - 有成效的

-Language proficiency - 语言能力

-Guidance - 指导

-Feedback - 反馈

-Improving speaking skills - 提高口语能力