Dear Mr Li,
       I'm sorry to tell you that I'm not feeling well today.I've caught a cold .I've had a headache and a cough.I didn't sleep well last night.I went to see the doctor.The doctor told me to stay in bed for two days.So I'm afraid I can't go to school today and tommorow.Thank you.
                                                                                                                                                                 Yours,
                                                                                                                                                             Wang Tao
【作文地带点评】本文是一篇请假条（请病假），格式正确，要点明确，表达清楚，语言自然地道，行文流畅。