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one day vs in one day

Both "one day" and "in one day" are correct, but they are used in different contexts. "One day" is used to refer to a single day in the future or past, while "in one day" is used to indicate that something will happen within a period of 24 hours.

Last updated: March 29, 2024 • 859 views

one day

This phrase is correct and commonly used in English to refer to a single day in the future or past.

Use "one day" when talking about a specific day in the future or past. For example, "One day, I will travel around the world."

Examples:

  • One day, I will be able to speak fluent English.
  • I hope to visit Paris one day.
  • One day, she woke up feeling different.
  • He promised to return one day.
  • One day, everything will make sense.
  • Until one day he got stabbed.
  • Perhaps even as match for gannicus one day.
  • Forget your friend for one day.
  • Survive and one day return home.
  • Miss Castillo could be me one day.
  • A woman two-timed me one day...
  • Me and Eddie started playing cards one day.
  • Then one day that hand gets clammy.
  • A one day non-refundable reservation fee.
  • Increase dosage one day for each year.
  • Because seminarians will be priests one day.
  • The detective was here one day.
  • Each attack was premeditated, one day apart.
  • You were leaving for one day.
  • Until one day Bork meet an interesting discovery.
  • Lessons lasting more than one day include video analysis.
  • All the itineraries last one day.
  • Perhaps one day the responsibilities will be ascertained.
  • During our project we used images taken one day apart.
  • Suddenly one day it started raining heavily.

Alternatives:

  • someday
  • eventually
  • at some point
  • in the future

in one day

This phrase is correct and is used to indicate that something will happen within a period of 24 hours.

Use "in one day" when referring to an action or event that will take place within a single day. For example, "I can finish this project in one day."

Examples:

  • I will complete this task in one day.
  • The package will arrive in one day.
  • She painted the entire room in one day.
  • He ran a marathon in one day.
  • The repairs were done in one day.

Alternatives:

  • within a day
  • within 24 hours
  • in a day's time
  • in a single day

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