拿到绿卡后如果都有报税, 或者你没有工作不需要报税,填NO。
拿到绿卡后如果你需要报税而曾经没有报税(failed to file tax returns),填YES。移民面谈官员将会要求你作出解释。
This question has been asked many many many times! Google USCIS explaination or lawyer's answers about this question yourself if you don't agree with the above.