标准翻译:Tomorrow we will say goodbye to him before he leaves at eight o'clock in the morning.
主语将来时,时间状语从句用一般现在时
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We will say goodbye to him before he leave at eight o'clock tomorrow morning.
Tomorrow we will say goodbye to him before he leave at eight o'clock in the morning.
Tomorrow we will say goodbye to him before he leave at eight o'clock in the morning
Tommorrow we will say goodbye to him before his leaving at eight o'clock in the morning. 或者Tomorrow we will say goodbye to him before he leaves at eight o'clock in the morning
Tomorrow we will say goodbye to him before he leave at eight o'clock in the morning 时间状语从句必须用现在时态