Itr

HI , You can definitely file  a income tax return for the year 2009-2010 , by 31march 2012 provided your assessment for that year has not best judged , you will also have to pay a interest under section 234A which is one percent for a month or a part thereof from 1aug2011 to till date and assessing officer also may levy a penalty of Rs5000 by section 271F. 

you can also file a return for the year 2010-2011 now with interest under section 234A which will be very small amount and also no penalty will be levied if filed by 31march 2012.