Dear XXX
亲爱的某某某
I'm writing to notify you that I won't be able to make it to work/school today due to illness. I am awefully sorry for the short notice and any inconveniences that my absence may bring to you. According to the doctor, I should make a full recovery within 2 days. So， I should be back to work/school the day after tomorrow.
今天去函想告知你，我今天因病无法去上班/上学了。非常抱歉这么晚才通知你。由于我的缺勤或许会给你的工作带来诸多不便，对此，我深表歉意。医生说了，我的病两天就会好的。所以，我后天就会去上班/学。
Thank you for your patience and understanding.
谢谢你的耐心和理解
Best regards
谢谢你的耐心和理解
YYY
诚挚的某某某
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