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用英文寫的道歉信 I am terribly sorry to tell you that I am unable to attend your birthday part next Thursday evening. That is owing to the fact that my younger brother suddenly fell ill and was taken to a hospital this morning. I have to go there immediately and take care of him. As told by the doctor in charge, it will take around five days for him to recover and I have asked my boss for a leave. I really regret that I cannot go to celebrate yo