Dear Sirs or Madams,
Some days ago I did some on-line exercises.I wrote "I'll go awaywhen she is better".It was said that it was incorrect.and the correct sentence must be " I'll COME away when she is better".I don't know why.I am looking forward to hearing from you for help.
Thank you very much.
It depends. If you are talking to someone in the place where you are staying, you'd say 'go' because you will move away from that place. If you were talking on the phone to someone where you'll be heading, you could use 'come'.