one day与some day所连用的时态有何区别

one day与some day均可用作状语，表示“有一天”，但两者所连用句子时态稍有区别：

1. one day可指过去或将来，即可用于过去时态或将来时态。如：

One day the temperature was 30℃. 有一天温度达到30摄氏度。

I will [am going to] climb that mountain one day. 总有一天我要爬那座山。

One day people will be able to go to the moon on holiday. 总有一天人们可以到月球上去度假。

2. some day通常只指将来，即只用于将来时态。如：

We’re all going to be old some day. 总有一天我们都会老的。

Some day I’ll come back and marry her. 总有一天我要回来娶她。

注：有时虽然不是将来时态，但句子意思表示的是将来意义。如：

You’re sure to regret one day. 你准有一天会后悔。

I want to get married one day. But before that, I want to travel. 总有一天我要结婚。但在那之前，我要旅游。

另外，在特定语境中some day有时可指过去将来。如：

I never realized that some day I would be living in China. 我从未想到将来有一天会在中国居住。