There is only one form that F1 (including OPT) should file for tax return that is 1040 NR EZ. After spending 5 years in the US, you can file 1040.

You can not claim a dependent (even if you are married) or take standard deduction in your tax return as a F1 student. All you can deduct is state tax and exemption. Anybody filing any other form would be in big time trouble if you are selected for tax audit. However, the chances of being selected for tax audit is negligible.

If you use Turbo Tax and online tax, you will generally be filing as a US resident that is not acceptable as per US tax regulation. However, the chances of getting caught is negligible. Therefore, many students opt to file as a US resident that result in more tax refunds.

Good luck guys but be safe. I just wanted to share all these just to let those individuals know who really wanted to comply with the tax regulation.