A: A properly filed, pending Form I-485 green card application generally puts you in a period of stay authorized by the government for unlawful-presence purposes, so you generally do not accrue unlawful presence while it remains pending. That is different from lawful nonimmigrant status: filing does not preserve your former status after it expires.
A pending I-485 does not itself authorize employment or travel. It does not erase prior unlawful presence, status violations, unauthorized employment, inadmissibility, or other adjustment-eligibility defects. Whether the case can continue depends on the immigration category and history; spouses of U.S. citizens have exceptions from some adjustment bars. A pending application does not automatically protect you from removal. Review status, work authorization, and travel separately before the old status ends.
Sources: USCIS Policy Manual, Status Violations: https://www.uscis.gov/policy-manual/volume-7-part-b-chapter-4