写英语留学请假邮件时，需包含明确的主题、恰当的称呼、清晰的请假原因、请假时间、表明会弥补课程的决心以及礼貌的结尾。以下是一封示例邮件，你可以根据实际情况进行修改：
主题：Application for Leave
Dear [Professor's Name / Lecturer's Name / Tutor's Name]（具体的授课老师名字，如 Professor Smith）,
I hope this email finds you well. My name is [Your Name], and I am a [Your Grade] student in [Your Department]（所在系别，如 the Department of Computer Science）, currently enrolled in your [Course Name] course（课程名称，如 Advanced Mathematics）.
I am writing to request a leave of absence from [Start Date] to [End Date] due to [Reason for Leave].
Recently, I have been diagnosed with [Illness Name] by a doctor, and the doctor has strongly advised me to take [Number of Days] days off to fully recover.（以生病为例，若因其他事请假，需详细说明请假事由） I have attached the medical certificate for your reference.
During my absence, I understand the importance of keeping up with my studies. I plan to get the lecture notes from my classmates and catch up on the missed lessons through online learning materials. I will also make arrangements to submit any outstanding assignments on time. I am committed to making up for any lost time and ensuring that my academic performance does not suffer.
I apologize for any inconvenience this may cause you and the class. I sincerely hope you can understand my situation and approve my request.
Thank you for your kind consideration.
Sincerely,
[Your Name]
[Your Student ID]
[Contact Information]（如邮箱地址或电话号码）