如何用英语写请假条（患重感冒不能去上学,请写一张请假条）按提示词语

Dear Mr.Green,Yesterday,on my way home,I was caught in a heavy rain.Hence,I had a bad cold today.I feel terrible therefore I went to consult a doctor this morning.Doctor prescribed some medicine for me and advised me to stay in bed for two days.Therefore,Mr.Green,May I have your permission to take 2 days' leave from school.I shall be back to school as soon as I recovery.Thank you.Yours faithfully,Betty.