Dear Ms Ma,

敬爱的马老师：

　　I apologize that I cannot go to school today.

　　很抱歉我今天不能去上学了。

　　Last night my mother had a high fever and coughed badly. I think that she has got flu.

　　昨天夜里我妈妈发高烧，咳嗽得厉害，我想她可能是得了流感。

　　She didn't have a good sleep and is very weak today, so I will go to Tiantan Hospital with my mother, and then stay at home to attend her.

　　昨天晚上她休息得不好，而且今天很虚弱，所以我陪妈妈去天坛医院，然后在家照顾她。

　　Because of this I have to ask for leave.

　　因此我不得不请假。

　　I will appreciate you very much if you can allow my leave.

　　如果您能准假我会非常感激。

　　Yours, Li Li

　　您的学生 李丽