when is Tom? He's left a message saying that he has something important to do.请问怎么翻译,

问题描述:

when is Tom? He's left a message saying that he has something important to do.请问怎么翻译,
特别是那个when ,不是什么时候是意思吗,在这里怎么翻译

汤姆什么时候到?他留话说有些重要的事儿要做.
这里的When是对应后半句有事做的(有事做就会晚一点).