-You had better extend your H1 because this is the last chance for you to keep your H1 status though you can use EAD to work.
1)申請父母來探親要出示有效身份,這樣怎麽證明有效身份
-I-485 receipt and copy of EAD.
2)如果去另外一個國家旅遊,比如日本,申請日本簽證,如何證明美國的有效身份
-Not need to provide your美國的有效身份 for 申請日本簽證, but your Chinese passport. You need to use AP for the international travel (come back to U.S.).
3)轉換新雇主的時候,H1b不是也轉麽,到時候原有的H1b已經過期了,怎麽辦?
-Show your EAD to the new employer if you do not have H1 status.