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我读了n－400的instruction （m－477），好像说是：

If you are applying for naturalization on the basis of marriage to a U.S.citizen, send the following 4 items:

which includes tax returns

If you have taken any trip outside the United States that lasted 6 months or more since becoming a Lawful Permanent Resident, send evidence that you continued to live, work and/or keep ties to the United States, such as:

which includes tax returns.

可是我们都不属于这两类。请问8老师我们还需要tax returns 吗？
-Then, not need it.