You can download a blank copy of the 1040 form here:
http://www.irs.gov/pub/irs-pdf/f1040.pdf (pdf format)
However I think you need one that was filled out last year (I assume). You're supposed to keep a copy of it for yourself after you send it in. I don't know if the government gives out copies of them to people. You can check the IRS website for more info:
http://www.irs.gov