Task: Text to Code
Input (English): SQL: SELECT T1.ID FROM instructor AS T1 JOIN teaches AS T2 ON T1.ID = T2.ID WHERE T2.year ! = 2010
Feedback: Ensure that semester equals Fall , year equals 2009 but semester not equals Spring , year not equals 2010.
Output (English): SELECT id FROM teaches WHERE semester  =  'Fall' AND YEAR  =  2009 EXCEPT SELECT id FROM teaches WHERE semester  =  'Spring' AND YEAR  =  2010