給孩子填N400申請公民。有個問題請問各位老師。

我孩子現18 歲，一直作為Dependent 隨我們保稅。現要填N400 表申請公民。

Part 11, Item 7:
  a: Have you ever not filed a Federal, State, or local Tax return since you became a Perment Resident?
  b. If "yes", did you consider yourself to be a "non-US resident"?

請問各位老師，這應該填yes 還是 No? 他從沒自己獨立報過稅。