I had to run away for fear (that) he might one day kill me.(我只好逃走，生怕他有一天把我殺了。)

She forgot to lock her door one day and two men got in.(她有一天忘了鎖門，結果兩名男子進去了。)

One day, he walked out of the house with a small bag and never came back.(一天，他帶了個小提包走出家門，再也沒有回來。)

After just one day, she had already made an enemy of her manager.(剛過一天她就已經與經理為敵了。)

Then one day his worst fears were confirmed.(后來有一天，他最大的擔心被證實了。)

He hopes one day to surpass the world record.(他希望有一天能刷新世界紀錄。)

Maybe she would talk to her mother one day, woman to woman.(也許有一天，她會和媽媽進行一次推心置腹的談話。)

One day he chanced upon Emma's diary and began reading it.(有一天他偶然發現了埃瑪的日記，便開始讀了起來。)

I never know what to expect from one day to the next.(一天又一天我不知道該期待什么。)

After only one day, his shoes were already scuffed and dirty.(只一天，他的鞋就穿臟磨壞了。)