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SOMETIME/SOME TIME |
"Let's get together sometime." When you use the one-word form, it suggests some indefinite time in the future. "Some time" is not wrong in this sort of context, but it is required when being more specific: "Choose some time that fits in your schedule." "Some" is an adjective here modifying "time." The same pattern applies to "someday" (vague) and "some day" (specific).