If you could be in trouble, you should refuse to answer any questions regarding a crime you are suspected of committing; leave the talking to your lawyer.
You do not have to speak to the police. In fact, speaking to the police can only hurt you.
You literally do not have to answer any questions the police ask! The best answer you can give is, “Respectfully officer, I do not have to answer that question.“
If you feel the need to respond, respond with: “Am I free to leave?” Ask that after every question the officer asks.