sometime, sometimes, some time

sometime: adverb meaning at some indefinite time:

            I'll be there sometime.

Sometime is not hyphenated in compound modifiers.

sometimes: adverb meaning occasionally:

            Sometimes articles editors disagree with the editorial Style Manual.

some time: adverbial phrase meaning an interval:

            He left some time ago

            the Style Manual has been under revision for some time.

See also: someday, some day.