Can I still file last year's taxes (2006) ?!?

Heres the situation... I'm 17 years old and I live with my grandfather who claims me. I didn't kno I could file my taxes last year (even tho he was claiming me) so I didn't. Now this year, I found out I can file even if I'm being claimed... So now I'm wondering if I can go back and file my... show more Heres the situation... I'm 17 years old and I live with my grandfather who claims me. I didn't kno I could file my taxes last year (even tho he was claiming me) so I didn't. Now this year, I found out I can file even if I'm being claimed... So now I'm wondering if I can go back and file my taxes from 2006? - If so, what forms do I have to fill out? --- Or can I just do it online like I plan on doing with this years?!?
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