我来美第6年，去年的税表按resident报。妻子来美4年，去年和我一起报税。现在已行
寄给他W-8BEN（Certificate of Foreign Status of Beneficial Owner for United
States Tax Withholding)表格，还应该填这个表格吗？在附件A上有这样一句话：As I
have certified on my Form W-8BEN, I am not a citizen or resident of the
United States or other U.S. person for purposes of U.S. tax law. 这句话该怎
么理解？
