Question

她的妈妈已经离家至少有一个月了。

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Answer

Her mum has been away from (her) home for at least one month.

【解析】

这是陈述句，句子主语是“她的妈妈”用her mum，根据“已经”可知句子是现在完成时，leave是短暂性动词，不能与表示一段的时间状语连用。谓语动词“离家”用延续性形式be away from的现在完成时has been away from,宾语是her home，her可省略。时间状语用for引出一段时间，表达“至少有一个月”用短语at least one month。故答案为Her mum has been away from (her) home for at least one month.