someday, someplace, sometime:
Someday (or some day) is idiomatic in British English (Someday [or some day] I'll take you away from all this), but someplace is not used at all except as a conscious Americanism (I must have left it someplace). Sometime is written as one word as an adjective meaning 'former' (a sometime president of the Rotary Club), and as an adverb meaning 'at some time' (I'll see you again sometime).
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