I solemnly vowed that someday I would return to live in Europe.

我郑重起誓总有一天我要重回欧洲生活。

《柯林斯英汉双解大词典》

Maybe someday I will give you back!

也许有一天我会还给你！

youdao

I believe in angels, and someday I believe I will see her again.

我相信天使的存在，也相信有一天我还会再见到她。

youdao

An hour later she said: "Someday I hope to paint the Bay of Naples."

VOA: special.2009.08.01

All I'm saying is that if someday we found that, at that point,we'd have an argument for the soul.

我要说的是，如果有一日我们发现这种情况，那时候才会有灵魂存在的论据。

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I'd like to go there again someday.

我希望有机会再去一次。

享受冲浪 - SpeakingMax英语口语达人

I, obviously, hope that someday I can come home, turn on CBS, and watch StarCraft.

FORBES: Move up http://i.forbesimg.com t Move down

All he asked in return was that someday I help the next guy in some small way.

FORBES: Robert Downey Jr. Asks Hollywood to Forgive Mel Gibson

If you keep this up, someday I might try filling you in on the structure of the Iowa caucus system.

CNN: Our subtleties explained