再请教8老师

谢谢8老师。

如果我和孩子file I539之后再出境，回来前也要再签吗？新加坡护照进美国是免签的。"if a visa is not required..." 不是很明白这段，新加坡籍适用吗？

I-797A: A person granted a change of status who leaves the U.S. must normally obtain a visa in the new classification before returning. The left part can be used in applying for the new visa. If a visa is not required, he or she should present it, along with any other required documentation, when applying for reentry in this new classification at a port of entry or pre-flight inspection station. The petitioner may also file Form I-824, application for Action on an Approved Application or Petition, to request that we notify a consulate, port of entry, or pre-flight inspection office of this approval.