英语作文请假条的基本结构和内容如下：

称呼

使用正式的称呼，如“Dear Mr./Ms. [姓氏]”或“Dear [姓氏] Li”等。

请假原因

清晰地说明请假的原因，如生病、受伤或其他紧急情况。例如，“I have got a cold and high fever.”（我感冒了，发高烧。）或“I was caught in the rain yesterday and I had a fever last night.”（我昨天淋雨了，昨晚发烧了。）。

请假时间

明确请假的起止日期。例如，“I would like to ask for a five-day leave.”（我想请五天假。）或“I need to rest for several days.”（我需要休息几天。）。

请假期间安排

如果可能，说明在请假期间如何补偿错过的课程或工作。例如，“I will attend school as soon as possible.”（我会尽快回到学校。）或“I will make up for the missed lessons after I recover from the illness.”（我病愈后会补上错过的课程。）。

结束语和署名

使用正式的结束语，如“Yours ever,”或“Thank you!”等，然后签上自己的名字。

```

Dear Mr. Zhang,

I am writing to you to ask for a five-day leave, as I have been diagnosed with a cold and high fever. The doctor has advised me to rest for several days to ensure my full recovery. Therefore, I will be unable to attend school until I am fully better.

I understand the importance of continuous education and I have always tried to maintain a positive attendance record. I sincerely apologize for any inconvenience my absence may cause, and I assure you that I will make up for the missed lessons as soon as I am able to return to school.

Thank you for your understanding and support. I look forward to your positive response.

Yours sincerely,

Xiao Li

```

请根据实际情况调整上述模板中的内容，确保请假条真实反映你的情况，并且表达清晰、礼貌。