8老师您好！非常感谢长期在这里解答问题。
这里请教8老师一个父母绿卡问题
我们是在父母B2签证延期，I-94过期而I-539pending期间给父母提交了绿卡申请。现在绿卡已经收到几个月了，今天收到了I-539的denial。
本来觉得拿到绿卡之后I-539的申请应该已经无关了，但是读到denial letter最后的warning concerning unlawful presence和overstay warning，还是觉得有些担心，想问问是否需要做什么。这些文字尽管很可能是generic的，但是看起来触目惊心啊。。。特别是那个overstay warning，还提到NTA的可能性，如下：
The evidence of record shows that, when you filed your application（这个指B2延期的申请）, you were lawfully present in the United States. Your period of authorized stay has expired.
You are not authorized to remain in the United States. If you do not intend to file a motion on this decision and fail to depart the United States within 33 days of the date of this letter, USCIS may issue you a Notice to Appear and commence removal proceedings......
请问8老师，这种情况下有必要担心可能的NTA之类的事情吗？有什么事情是我们现在可以做的吗？多谢多谢！！
