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When considering whether “sometime” would be the proper choice relative to “some time” in a sentence, the most helpful hint comes from asking yourself if, in the sense of what’s being said, it could be replaced correctly by “someday.” Meanwhile, not only is there a second meaning of “sometime” to keep in mind, but there's also the other word “sometimes,” with an entirely different definition.

The “sometime” word has faces two 
That tell of meaning dual;
Most often looking like “someday”
But “former,” too, to fool.

Yet “sometimes” comes along with “s,”
Expressing “now and then”;
“Occasionally” doth it mean,
That further stroke of pen.

And, next, “some time” we have to meet,
To question where it stands.
A “span of time,” to thwart defeat,
Its meaning for all fans.

So, two words make this one distinct,
An aid for weary minds
That wish for something more succinct,
A verse combining kinds:

If only we'd take some time to play,
Like sometime kids we were,
Then sometimes work we'd happy pay
To sometime life defer.