sometime
sometimes
some time

Not a problem when speaking, but is when writing. Can be confusing even for native speakers when writing.
SOMETIME
  • SOMETIME:  Sometime next month, I'm going to Rio.

  • SOMETIME:  Do you have sometime next week for a meeting?  Yeah, sure.
SOMETIMES
  • SOMETIMES:  Do you always play tennis on the weekends?   No, just sometimes.

  • SOMETIMES:  Sometimes I think English is going to drive me crazy!
SOME TIME
  • SOME TIME:  It will take you some time to learn to speaking English fluently.
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  • SOME TIME:  After knee surgery, it takes some time to for it to heal.