老人已有美国绿卡，经常回国长住，但不到半年就回。去年回美入境时官员好像问他为什么呆那么久（英语不好没太听懂），而且直摇头。他今年又回中国呆了5个多月，想问问入境时会不会有麻烦？现在有因为这种情况被拒入境或者绿卡没收的吗？
-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.
