老人已有美國綠卡，經常回國長住，但不到半年就回。去年回美入境時官員好像問他為什麽呆那麽久（英語不好沒太聽懂），而且直搖頭。他今年又回中國呆了5個多月，想問問入境時會不會有麻煩？現在有因為這種情況被拒入境或者綠卡沒收的嗎？
-It is possible the IO will give him warning and put a note in the system or his passport. Thus, he may have trouble for next time travel. He may apply for reentry permit which allows him to stay in China for > one year < two years.
