给孩子填N400申请公民。有个问题请问各位老师。

我孩子现18 岁，一直作为Dependent 随我们保税。现要填N400 表申请公民。

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"?

请问各位老师，这应该填yes 还是 No? 他从没自己独立报过税。