one day 可以表示“（过去）某一天”，谓语动词常用一般过去式，也可表示“（将来）某一天”，这时可与 some day 互相代替，谓语常用一般将来时。1. He will understand the teacher one day/some day. 将来有一天他会理解老师的。 2. One day I went to see my first teacher, but she happened to be out. 有一天我去看我的启蒙老师，可碰巧她出去了。
another day，可表示近期将来的某一天，意为“改天”，也可表示过去将来某一动作或状态延续的又一天。1. She is coming another day instead of today. 她今天不来，改天来。 2. You may do it another day. 你可以改天做这件事。 3. He stayed there (for) another day/another two days after I left. 我离开后他在那又待了一天/两天。
some day 指将来“有一天、有朝一日、终将、（日后）某一天”，谓语动词用一般将来时。Your wishes will come true some day. 总有一天你的愿望会实现的。
the other day 相当于 a few days ago，意为“几天前，不久前”，句中用一般过去时。1. I met her in the street the other day. 几天前我在街上碰见过她。 2. I bought the dress the other day. 这件连衣裙是我几天前买的。
in the past/last few days“近几天”与完成时连用
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