TN签证就要过期了，但是AP/EAD卡已经拿到了，在TN签证过期前，需要出境转身分吗？
-No. Just use EAD to work, no more TN extension due to I-485 filing.
还是可以继续待在美国，等下次出境时（TN签证已经过期),交回TN,再用AP入境？
-You can not use TN to enter US anymore if going out of US, and have to use AP to enter US and work using EAD after you use AP to enter US.
