It was my understanding that if you leave the country in the middle of the year, but you pass the substantial presence test, you can declare yourself a dual-status alien. You would file as a resident for the period of time you were a US person and a non-resident for the time after you moved out of the country.
What we don't know is when you came to the US and when you left, and whether you pass the substantial presence test. You say you "usually get a refund" so that makes it sound like you were in the US more than just 10 months. We also don't know if you were a resident alien or a green card holder (although @pk seems to have assumed you had a green card to surrender.)
When did you enter the US? How long were you here? Under what status? When did you leave? Which tax year are you asking about?
