多谢老师
假设我不renew绿卡，直接申请公民，大概多久能转成公民？
-I don't know. Case by case.
在转成公民之前假设我或换工作或出国，而我没有申请renew绿卡，我有什么办法嘛？
-No. You must file I-90 to renew your green card in this case. You can get the green card stamp on your passport at the local USCIS Office by bring your I-90 Receipt notice, and use the green card stamp to travel and work before you get the renewed green card or US citizenship.
绿卡有延期之类的说法，比如说盖一个章延6个月这样我有充足时间换公民？
-You need to show the I-90 filing receipt notice to get the stamp (see above).
