在雅思口语考试中，考生可能需要准备一份承诺书来表明自己会遵守考试规则。以下是一个可能的承诺书范文：
Dear Sir/Madam,
I am writing to formally agree to abide by the rules and regulations of the IELTS exam. I understand that the IELTS exam is a standardized test designed to assess my English language proficiency. I commit to doing my utmost to provide honest and accurate responses during the exam and to treat all examiners with respect.
I further commit to the following:
1. I will arrive at the exam venue at the scheduled time and stay until the end of the exam.
2. I will not engage in any form of communication with other candidates or examiners before, during, or after the exam.
3. I will not use any unauthorized materials or aids during the exam.
4. I will follow the instructions given by the examiners and answer all questions to the best of my ability.
5. I understand that any breach of these rules may result in my disqualification from the exam.
I hope to achieve a high score in the IELTS exam and demonstrate my proficiency in English. Thank you for your time and consideration.
Sincerely,
[Your Name]
这个范文涵盖了遵守考试规则、准时到达、不作弊、听从指令和尊重考官等关键点。当然，具体的承诺内容可能会根据考试要求和考生的个人情况有所不同。