Someday vs. Some day 

"Someday" vs. "Some day" in the English Grammar

What Is Their Main Difference?

Both refer to an unspecific time in the future. However, 'someday' is an adverb of time, whereas, 'some day' consists of the adjective 'some' and the noun 'day'. When we use 'some day', we know that something will happen on an unspecified day.

Differences

'Someday' is an adverb of time, whereas, 'some day' is a phrase that consists of an adjective plus a noun. Look at the examples below:

Example

Someday, I will see you and walk past you as if you never mattered to me in the first place.

They said that the riots will start some day this week.

Similarities

Both refer to an unspecified time in the future. Check out the examples below:

Example

The whole city will have to be evacuated some day soon.

I don't know when, but someday, I'll rip your heart out.

Are They Interchangeable?

Since they have different grammatical structures, they cannot be used interchangeably. Compare:

Example

Someday, you'll regret what you said.

X Some day, you'll regret what you said.

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