A: A pending Form I-485 green card application is not the same as keeping your old nonimmigrant status. Whether the case can continue after the old status expires depends on the immigration category and history. Spouses of U.S. citizens have important exceptions from some adjustment bars, but a pending case does not by itself give permission to work or travel. Understand the effect before the old status ends.
Sources: USCIS Policy Manual, Status Violations: https://www.uscis.gov/policy-manual/volume-7-part-b-chapter-4
Sources: USCIS Fraud Detection and National Security Directorate: https://www.uscis.gov/about-us/organization/directorates-and-program-offices/fraud-detection-and-national-security-directorate