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if you did not work in 2009 and did not have any taxable income - your possible deductions will not make any good as they might only reduce your taxable income.
As your taxable income is zero - there is nothing to reduce and there likely will not be any tax benefits for you.
That is correct - you do not have to file a tax return - however you still may file even you did not have any income - but there will not be any refund.
Let me know if you need any help.