写一封英文留学信通常包括以下几个部分：

开头

用正式的问候语开始，如 "Dear [Admissions Officer's Name]," 或 "Dear Sir/Madam,"。

简要介绍自己，说明写信的目的，比如推荐某人或申请某项目。

主体

第一段：明确表达你的主题，例如推荐某人或申请某个学位课程。

第二段及以后：详细阐述推荐人的资格、被推荐人的优点或申请人的资格和动机。

使用具体的例子和事实来支持你的陈述，展示你的知识和对被推荐人或申请人的了解。

结尾

总结你的推荐或申请，重申其重要性。

表达你对被推荐人或申请人的信心和祝福。

用正式的结束语结束，如 "Sincerely," 或 "Best regards,"。

签上你的名字。

```

Dear [Admissions Officer's Name],

I am writing to express my interest in pursuing the Master's program in [Field of Study] at [University Name]. As a [Your Current Position/Role] at [Your Institution], I have had the privilege of working with [Name of Person Being Recommended] and have witnessed their exceptional abilities and dedication firsthand.

[Name of Person Being Recommended] has demonstrated a strong aptitude for [Specific Skill or Quality], which I believe will greatly benefit them in the [Specific Program or Field of Study] at [University Name]. Their academic achievements, coupled with their extracurricular activities and work experience, make them an ideal candidate for this program.

Furthermore, [Name of Person Being Recommended] has shown a keen interest in [Specific Aspect of the Field or Program], which aligns perfectly with the curriculum and faculty at [University Name]. Their passion for learning and commitment to excellence are evident in all their endeavors.

I am confident that [Name of Person Being Recommended] will excel in their studies and make significant contributions to the [University Name] community. I highly recommend them for this program and am confident they will achieve their academic and professional goals.

Thank you for considering my recommendation. Please feel free to contact me if you require any further information.

Sincerely,

[Your Full Name]

[Your Position/Role]

[Your Institution]

[Your Contact Information]

```

请根据实际情况调整上述模板中的内容，确保信件真实反映你的意图和所推荐人的情况。