Someday vs. Some Day: What’s the Difference?

Although they look similar, someday and some day do not mean the same thing.

Someday → ✔ an unspecified time in the future Some day → ✔ an actual, specific (but unnamed) day

They are both correct depending on the context.

1. Someday

Meaning

Someday is an adverb meaning “at some future time” — vague, general, and unspecific.

It describes hopes, dreams, long-term goals, and indefinite future plans.

Examples (10 total)

1. Someday, I want to travel the world.
2. She hopes to write a book someday.
3. Someday, everything will make sense.
4. He’ll understand it someday.
5. Someday, they will meet again.
6. I’ll buy my dream car someday.
7. She wants to live by the ocean someday.
8. Someday, we’ll laugh about this.
9. He plans to learn Italian someday.
10. The truth will come out someday.

🧠 Tip:
If the time is unknown, vague, or hopeful, use someday.

2. Some Day

Meaning

Some day (two words) means “a particular but unspecified day.”
It is more literal than “someday.”

Use it when referring to an actual individual day, not a general future.

Examples (10 total)

1. I’ll call you again some day next week.
2. She plans to visit your office some day soon.
3. Some day this month, we need to talk.
4. He’ll return some day in July.
5. We should meet some day after work.
6. Some day soon, you’ll receive the package.
7. They’ll announce the results some day next month.
8. She’ll stop by some day when she’s free.
9. Some day this year, they will move houses.
10. He’ll finish the project some day before the deadline.

🧠 Tip:
If you’re talking about an actual, real day, even if unnamed → some day.

3. Quick Comparison Table

4. How to Remember

👉 Someday = someday… eventually (big dreams, long-term hopes)
👉 Some day = one day out of many days (real calendar day)

Memory trick:
If you could replace it with “one day”, use some day.
If you could replace it with “eventually”, use someday.

5. Common Mistakes

❌ Using someday when talking about a real date
✔ Use some day

❌ Writing some day for hopes or dreams
✔ Use someday

❌ Thinking they are interchangeable
✔ Their meanings differ based on specificity

Writing More Naturally

Choosing between someday and some day can subtly change the meaning of a sentence. If you want your writing to feel natural and avoid confusing phrasing, an AI humanizer can polish your wording and help you choose the right expression every time.

FAQs

1. Do they mean the same thing?

No. Someday is vague; some day is specific.

2. Which one should I use for hopes or dreams?

Use someday.

3. Which one refers to a real day on the calendar?

Some day.

4. Is “someday” formal or informal?

It's neutral and fine in both casual and formal writing.

Practice: Choose the Correct Phrase

(Answers are at the end.)

1. __________, I want to move abroad.
2. She’ll visit you __________ next week.
3. We hope to buy a house __________.
4. He’ll return __________ in August.
5. __________, you’ll understand everything.
6. I’ll meet him __________ after work.
7. She dreams of becoming a pilot __________.
8. The package should arrive __________ soon.
9. We’ll finish the project __________.
10. He’ll call you __________ this month.

Answers

1. Someday
2. some day
3. Someday
4. some day
5. Someday
6. some day
7. Someday
8. some day
9. Someday
10. some day