You should file your taxes jointly with your spouse even if you have no income. All this means is that your spouse would add your name and personal information to the tax form. This is advisable not only to get a better refund, but also if you intend to apply for citizenship in the future. Also, if you need to remove the conditions on your green card, you will have the tax forms as evidence that you share a life together.
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You probably received a conditional green card and will need to lift the conditions in two years. Do yourself a favor and file as married filing jointly so you have good evidence that the conditions should be lifted in two years.
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