假如你叫李明，因患重感冒今天和明天两天不能上学，请你给你的外籍英语教师写一张请假条，

Dear Mr . Green ,
I‘m very sorry to tell you that I'm sick , I have a bad fever, so I can't go to school today. So I'm writing a request for leave. I hope that you can permit me.

Thank you .
Yours ,
Li Ming

希望能帮到你，祝更上一层楼O(∩_∩)O
有不明白的请继续追问(*^__^*)

Dear Mr. Green，
　　I’m very sorry to tell you that I’m not feeling well today. This morning I went to see a/ the doctor and he told me that I had caught a bad cold. He also asked / told me to stay in bed for two days. So I can’t go to school today and tomorrow. I hope to go back to school as soon as I get well. Please don’t worry about me . I’ll make up for the lessons that I have missed when I am back at school. Thank you.
　　 Yours，　　
Li Ming

Dear Mr. Green,
I am very sorry to tell you that I can not go to school beacase I am not feel well.I have a
bad cold today.The doctor said I have to stay in bed for about two days.I am very sorry.I hope I get well soon and go back to school quckily.
Thank you.
　　 Yours，　　
Li Ming

Dear Mr . Green ,
I‘m very sorry to tell you that I can't come for class today due to a bad cold. I went to see a doctor and he suggest I ask for a 2-day leave for recovery. Hope to get your approval and understanding.
Thank you .
Yours ,
Li Ming

Dear teacher:
I am sorry I can not go to school beacase I am not feel well.I have a bad cold today.The doctor said I have to stay in bed for about two days.I am very sorry.I hope I get well soon and go back to school quckily. LiMing