Polygamy is a criminal offense. Marriage is under civil law. So they are different.
Unless you received a court order saying that your marriage has been dissolved, divorced, or annulled, always assume everything is still valid.
2. If the criminal proceeding has also voided the marriage, court document will show.
3. Yes - Please note the record may not be located in Sha Tin.
4. Yes - if one has issued.
Simply saying - unless you have proof for dissolution of both marriages, you are still married.
更新1:
真是謝謝你們的幫忙........我明白了