假如你是李華，好朋友Sarah邀請你去參加他的生日聚會，但由于弟弟突然生病，醫(yī)生說需要住院5天左右，請寫信給Sarah表達(dá)未能和老朋友一起給他慶祝生日的歉意，并請Sarah幫忙轉(zhuǎn)達(dá)對朋友們的問候。
    【優(yōu)秀滿分范文】
    Dear Sarah,
    I am terribly sorry to tell you that I am unable toattend your birthday party next Thursday evening. That is owing to（因?yàn)椋?the fact that （同位語從句）my younger brother suddenly fell ill and was taken to a hospital thismorning. I have to go there immediately and take care of him. As told by thedoctor in charge, it will take around five days for him to recover and I haveasked my boss for a leave.
    I really regret that I cannot go to celebrate yourbirthday personally and would miss the perfect chance of enjoying myself withall our old friends. I have chosen a small gift for you and will send it to youtomorrow to show my best wishes. Besides, please give my regards to our friendswhen you meet them at the party.
    Cordially, （sincerely）
    Li Hua