在衡水體英語作文中，80字的篇幅要求我們簡潔明了地表達觀點。以下是一篇符合要求的范文：

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Dear John,

I am happy to inform you that I have successfully passed the English exam. Your help was invaluable. I appreciate your patience and guidance in improving my language skills. Thank you once again for your support.

Best regards,

Li Hua

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這篇作文通過簡短的文字表達了對朋友幫助的感激之情，并說明了考試的結(jié)果。