| Singhaln:
When precisely did you arrive in the U.S.?
If you arrived in 2001, then your F-1 visa status has not run out. You are technically dual-status, but you can file as a resident alien because you meet the Substantial Presence Test (exactly 183 days if you do not count July 1st).
If you arrived anytime in 2000, your exemption status under the F-1 visa has expired, which again means filing as a resident alien.
As a resident alien, you file the normal tax forms (Form 1040/1040A/1040EZ). Under these circumstances, you cannot claim any treaty exemption. However, you can claim the standard duduction, which is what the treaty exemption allows anyway, so it's a wash. | 
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