1. one day可指过去或将来,即可用于过去时或将来时。
One day the temperature was 30℃.
One day people will be able to go to the moon on holiday.
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2. some day通常只指将来,即只用于将来时态。
We’re all going to be old some day.
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注:有时虽然不是将来时态,但句子意思表示的是将来意义。
You’re sure to regret one day.
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另外,在特定语境中,some day有时可指过去将来时。
I never realized that some day I would be living in China.
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